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  #1  
Old 01-18-2016, 02:13 AM
jrabenius jrabenius is offline
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Default replacement barrels for the M&P 10

we're not sunk.

YOU CAN replace the barrel on your M&P 10.

Those of you out there that have /are/will experience barrel failures can always send the rifle in for warranty replacement.

For those of us out there that want something different, read on.

I have heard that the DPMS barrel fits the M&P 10 receiver. I HAVE NOT TRIED THIS MYSELF, but it is a good assumption since the free float rail, hand guards, and the barrel nut threads are the same as the DPMS LR-308.

The bolt carrier group is referred to as a DPMS LR pattern.

LOTS of companies are making DPMS LR pattern bolts. They range in price from $149 to $349.

Just to give you an idea, here is what Primary Arms sells:

AR-308 Bolt Carriers | Primary Arms

There are lots of replacement barrels for the DPMS 308. Primary Arms has 2 PAGES of ar-308 barrels.

AR-308 Barrels | Primary Arms

The gas tube would also be for a DPMS LR-308, and would correspond with the barrel selected.
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Old 01-31-2016, 09:01 PM
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Very curious if anyone has assembled a DPMS barrel/BCG in the S&W upper and has success.
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Old 01-31-2016, 10:32 PM
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If anyone on here has, they have not mentioned it.
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Old 02-04-2016, 04:20 AM
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I think the proprietary barrel extension that S&W utilizes on the M&P10 is the "gotcha" here. From the other threads here, I've read you can utilize a DPMS pattern barrel (and a bolt to work with it), but you'd have to refit the existing S&W extension from your M&P10's oem barrel and have a gunsmith turn the new barrel down to fit and mount the extension. This was what BHW was proposing, if I understood correctly.

I am very much interested in seeing this work, since S&W isn't very responsive with spare parts for the M&P10 let alone spare barrels.
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Old 02-07-2016, 12:32 AM
jrabenius jrabenius is offline
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Default (I think) you're partially right . . .

The S&W barrel extension would most likely be used if you kept the S&W bolt and bolt carrier. The S&W bolt is mated with the S&W barrel extension to provide the proper head spacing.

That's what Black Hole Weaponry was attempting.

I spoke with someone from BHW, who thinks that the DPMS bolt carrier group when used with a DPMS patterned barrel would be a drop in replacement.
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Old 06-22-2016, 09:42 PM
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Anyone find out for sure about the barrel swap? Any info would be greatly appreciated.
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  #7  
Old 08-23-2016, 04:19 PM
Small Holes Small Holes is offline
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Default dpms barrel on mp10

I had the same problem, 308 barrel shot out. wanted a 6.5 creedmoor barrel so I ordered one and it doesn't fit! bummer! so, I purchased a used dpms lr308 and put my new barrel on it. shoots decent but I'm not as happy as I think i can be. the dpms has a very clunky fit between upper and lower. the mp 10 has a very tight fitting upper to lower, {I like the little rubber tits between the upper and lower that eliminates rattle and the fact that it is ambi and it is a smith&wesson!} so I purchased a new bolt to see if I can put the dpms style barrel on the mp10. the bolt is the same in every way but one, the tail end of the bolt od is .2485 on the dpms and the bolt tail on the mp10 is .310 so that creates a huge gas leak at the back of the bolt and it blows it in your face without cycling. the next step would to be to press a bushing into the bolt carrier to tighten up the gap. since I have both rifles I decided to forgo all of that and do an experiment, so I put the whole dpms bcg in the mp10 upper w the dpms barrel and viola it works great! only downside is the forward assist doesnot work anymore.but hey if you need the forward assist then you have a problem w the rifle and shouldn't shoot it anyway right? hope this helps as there is a do it yourself solution!

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Old 08-25-2016, 05:04 PM
Small Holes Small Holes is offline
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Default dpms barrel on mp10

so, being the perfectionist that I am, the dpms bolt carrier without forward assist just didn't set right w me. I modified the MP10 bolt carrier to fit the new nickel boron bolt. I now have a S&W MP10 with an Aero Precision 20inch 6.5 creedmoor barrel! the best part is, if I choose to go back to the original M&P barrel and bolt I can. the modification is fully reversible.
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Old 08-25-2016, 07:29 PM
WYoung WYoung is offline
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Quote:
Originally Posted by Small Holes View Post
so, being the perfectionist that I am, the dpms bolt carrier without forward assist just didn't set right w me. I modified the MP10 bolt carrier to fit the new nickel boron bolt. I now have a S&W MP10 with an Aero Precision 20inch 6.5 creedmoor barrel! the best part is, if I choose to go back to the original M&P barrel and bolt I can. the modification is fully reversible.
Great news! I wanted to try that but didn't want to sink the money if it wouldn't work.
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Old 08-29-2016, 10:54 PM
copemech copemech is offline
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Quote:
Originally Posted by Small Holes View Post
so, being the perfectionist that I am, the dpms bolt carrier without forward assist just didn't set right w me. I modified the MP10 bolt carrier to fit the new nickel boron bolt. I now have a S&W MP10 with an Aero Precision 20inch 6.5 creedmoor barrel! the best part is, if I choose to go back to the original M&P barrel and bolt I can. the modification is fully reversible.
Great to see some confirmation on this issue. Can you tell why the FA does not function or does the bolt simply not have the serrations cut?

How did you mod the bolt carrier? A bushing? I ran this across my feeble grey matter and wondered what would keep that from blowing out?

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Old 09-03-2016, 06:42 PM
Small Holes Small Holes is offline
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the mp10 bolt has serrations in the bolt carrier and the pusher is mounted toward the rear of the upper. the dpms has the pusher located more towards the front of the upper, with a single ridge toward the front of the bcg that the pusher pushes on. the hole in the rear of bcg piston chamber is measured and a bushing is turned on a lathe to be a .003 interference fit. it is pressed in the bcg with a 5 ton arbor press, its very tight! the bgc is put into a 15/16 collet chuck on the lathe and the bushing where the bolt tail goes into the bcg is reamed w a .252 reamer. ive got 300 rounds down the pipe now with no issues. the rifle with its new Ballistic Advantage 6.5 creedmoor barrel now shoots just under 1/2 in. groups with Hornady 140ELD match ammo with no muzzle brake and little recoil, as opposed to 1 1/2 - 3 in. groups w factory barrel and 168g match 308.
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Old 09-15-2016, 10:24 AM
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This is GREAT news! This was my next attempt - just swapping out the barrel and bolt completely. Excellent to hear that it works.
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  #13  
Old 09-17-2016, 05:29 PM
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Lightbulb Congratulations (on cracking the 'nut')

Quote:
Originally Posted by Small Holes View Post
so, being the perfectionist that I am, the dpms bolt carrier without forward assist just didn't set right w me. I modified the MP10 bolt carrier to fit the new nickel boron bolt. I now have a S&W MP10 with an Aero Precision 20inch 6.5 creedmoor barrel! the best part is, if I choose to go back to the original M&P barrel and bolt I can. the modification is fully reversible.
I assume to make it "reversible" you press the bushing out, even though I cannot understand why someone would want to go back to the proprietary barrel/extension..
Good skull-work!
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  #14  
Old 09-25-2016, 09:05 PM
4mer03e5 4mer03e5 is offline
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Default hbar option for M&P 10

Is there a 20-24" HBAR that will fit "our" rifles? I would think a longer heavy barrel floated upper would be a great start to a serious tack-driver. Just looking for opinions and guidance on this. I may seek the camo/HBAR m&p 10 to mod out. My scoped/"stock" m&p 10 is great just looking at options and opinions. Thanks in advance and Semper Fidelis!!!
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  #15  
Old 09-27-2016, 08:17 PM
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I wonder if a machine shop could cut the rearward serrations on a DPMS bolt carrier such that the S&W forward assist might then engage and work with the DPMS bolt?

That might prove to be the best of all worlds.
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  #16  
Old 09-28-2016, 09:01 PM
Small Holes Small Holes is offline
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jp enterprises bcg has em
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  #17  
Old 09-29-2016, 04:51 PM
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Quote:
Originally Posted by Small Holes View Post
jp enterprises bcg has em
As soon as I submitted my reply, I had one of those "duh" moments. Primary Arms sells DPMS pattern bolt carriers and bolts.

I find it a revelation that such a barrel/bolt carrier group swap puts the M&P 10 back on par with most other DPMS based AR10's. My barrel is not shot out, but the potential to switch to another caliber when the time comes is intriguing. The .243 Win. round has always interested me and might be fun in an AR platform.

I find it somewhat incredulous that S&W determined it had to take a difficult path to their M&P10's, tho I must say they seem to run really nicely.

Thank you for your contribution to this thread and body of knowledge.
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Old 10-07-2016, 08:22 PM
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Quote:
Originally Posted by Small Holes View Post
jp enterprises bcg has em
So, if I'm following you here, a DPMS pattern barrel with any decent DPMS pattern AR308 BCG should be a complete match without the need for machine work? I was looking specifically at the Aero Precision Nickel Boron BCG - which does have the forward assist grooves along the side of the BCG.
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Old 10-10-2016, 09:06 PM
Small Holes Small Holes is offline
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aero p wont work. dpms pattern only
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  #20  
Old 10-10-2016, 09:57 PM
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Small Holes:

This is the Aero Precision Nickel Boron BCG at Primary arms - their description says its a DPMS patterm BCG. Am I missing something else here?

Aero Precision .308 Complete Bolt Carrier Group - Nickel Boron - APRH100185
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Old 10-11-2016, 07:30 PM
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Thumbs up AERO is good equipment!

Quote:
Originally Posted by Gischileu View Post
Small Holes:

This is the Aero Precision Nickel Boron BCG at Primary arms - their description says its a DPMS patterm BCG. Am I missing something else here?

Aero Precision .308 Complete Bolt Carrier Group - Nickel Boron - APRH100185
Can't confirm your application but I can say that this BCG does fit a DPMS pattern and IS a first-class unit.
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Old 10-15-2016, 09:13 PM
Small Holes Small Holes is offline
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Default dpms barrel on mp10

for 150.00 I can make your mp10 bcg work. includes a new nickel boron coated bolt.
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Old 11-19-2016, 09:05 PM
Small Holes Small Holes is offline
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Default MP10 is a great shooter!

took a crow today at 560 yds! love this thing!!
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Old 12-22-2016, 04:09 PM
Mizerle Mizerle is offline
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Quote:
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for 150.00 I can make your mp10 bcg work. includes a new nickel boron coated bolt.
I'm interested. Are you still providing this service? I sent you an email but never got a response.
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Old 12-22-2016, 04:31 PM
Small Holes Small Holes is offline
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Default dpms barrel on mp10

yes I am. 417-239-5392
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Old 02-11-2017, 12:14 PM
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While not a barrel replacement, the following is the response I recently got from S&W about the availability of complete uppers in other chamberings.

Thank you for letting us know how you feel about the unavailability of the M&P 10 uppers. Unfortunately, it is a company decision, however I will forward your email to our engineers so they can see that it is frustration to our customers.
Regards, Rachel
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Old 02-11-2017, 05:05 PM
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Meanwhile, one can get an M&P15 upper just about any where they want....
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Old 04-30-2017, 06:17 PM
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Angry MP10 Nightmare

Bought new MP10 and gun dealer upgraded barrel to Mega Arms DPMS Clone. Have not been able to shoot since new light strikes or none...Only SW firing pin can be used as it has spring on it and AR pins are much bigger. I'm lost and out of a lot of money as the gun dealer went out of business and now I feel like I do have a frankengun. Anyone who owns a MP 10 does the firing pin not protrude much out of BCG? Mine barely comes out....No one here in CA wants to touch it as they have no experience with MP10....I have also been told by SW that you cannot use a different bolt as it is a different size. Need real help here
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Old 05-02-2017, 12:21 AM
copemech copemech is offline
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Quote:
Originally Posted by jmonioz View Post
Bought new MP10 and gun dealer upgraded barrel to Mega Arms DPMS Clone. Have not been able to shoot since new light strikes or none...Only SW firing pin can be used as it has spring on it and AR pins are much bigger. I'm lost and out of a lot of money as the gun dealer went out of business and now I feel like I do have a frankengun. Anyone who owns a MP 10 does the firing pin not protrude much out of BCG? Mine barely comes out....No one here in CA wants to touch it as they have no experience with MP10....I have also been told by SW that you cannot use a different bolt as it is a different size. Need real help here
My current understanding is that to use a DPMS pattern barrel, you would need to also use a DPMS bolt carrier and bolt assembly. You would also need to check headspacing on the components as the FP protrusion could cause light strikes as well on a loose assembly. I am not sure if DPMS uses a FP spring either, and depending upon ammo, this combo could cause issues, as the original gun was set up for commercial hunting ammo with potentially lighter primers than a mil spec projectile.
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Old 06-03-2017, 03:09 AM
jmonioz jmonioz is offline
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Default Smith & Wesson M&P 10 Upgrade

Originally I posted a horrible experience I had as I thought that my new MP10 could not be upgraded from factory and that I was just stuck with a huge paperweight with worthless expensive upgrades. I am 100% wrong and I think that the main issue was the fact that I was dealing with the wrong gun dealer and the wrong so called armorers that said they knew it all! After much research and I mean a lot of research I have found all of any issues non-existent and I am 120% satisfied with the Smith & Wesson M&P10. I will post pictures soon to show how my build went and I hope that this gives everyone an idea of what to expect with this gun. So yes you can upgrade this gun easily with many mods....One huge suggestion before doing anything to a perfectly made gun right off the shelf is shoot the darn thing and put a lot of rounds in it before you change anything out! I highly recommend this gun and wish that this knowledge was available to me years ago. Smith & Wesson stock is an excellent rifle off the shelf and I am very happy to see how much thought S&W has put into this gun. Happy with my AR's but this one takes the cake. Very solid and clean and well built. No gap issues or noises as it seems this gun is very tight in all aspects. Thanks for any prior posts from people in here to help out with the build. Parts that can be used for your build. Armalite AR10 BCG/DPMS pattern with firing pin and spring similar to the S&W stock BCG, Mega Arms Barrel 16" DPMS, head space not an issue with the parts and perfect, DPMS float handguard, Uber Stock.....Comp was custom tuned to match barrel. Main thing because I am so damn anal, no modifications were done to this gun, such as dremmeling or changing.
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  #31  
Old 06-07-2017, 05:25 PM
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I just swapped to an aero bcg and aftermarket barrel. I've only done quick test fire session for operation. Every thing is working good so far will post again after its run hard a few times
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Old 06-30-2017, 10:14 PM
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Quote:
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I just swapped to an aero bcg and aftermarket barrel. I've only done quick test fire session for operation. Every thing is working good so far will post again after its run hard a few times
Any updates? I'd like to know in the future that I can change out my barrel to a 20in
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Old 08-26-2017, 08:14 PM
cclark89 cclark89 is offline
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Hoping for some help.

Based on this thread, pulled my barrel and threw in a Ballistic Advantage 6.5 Creedmoor barrel and an Aero BCG.

Keep getting Feed errors using Gen 2 and 3 Pmags with 140gr American Gunner. The bolt either skims the top of the round and closes empty, or it half picks up the round but jams on the way in the chamber with the point hitting the roof of the barrel extension.

Did you who swapped to 6.5 have to modify your mags to get good feeding?
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Old 08-26-2017, 08:20 PM
cclark89 cclark89 is offline
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To add. When chambering a round manually using the CH or bolt release, it picks the round up fine.
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Old 08-28-2017, 12:30 AM
MistWolf MistWolf is offline
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Hoping for some help.

Based on this thread, pulled my barrel and threw in a Ballistic Advantage 6.5 Creedmoor barrel and an Aero BCG.

Keep getting Feed errors using Gen 2 and 3 Pmags with 140gr American Gunner. The bolt either skims the top of the round and closes empty, or it half picks up the round but jams on the way in the chamber with the point hitting the roof of the barrel extension.

Did you who swapped to 6.5 have to modify your mags to get good feeding?
Does it lock back on an empty mag on the last shot?

Last edited by MistWolf; 08-28-2017 at 12:32 AM.
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Old 08-28-2017, 11:50 AM
cclark89 cclark89 is offline
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Does it lock back on an empty mag on the last shot?
No it was failing to do so.

Now on rifle-length gas.

Last edited by cclark89; 08-28-2017 at 11:55 AM.
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Old 08-28-2017, 05:21 PM
MistWolf MistWolf is offline
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No it was failing to do so.

Now on rifle-length gas.
Then it is short stroking. Either ammo is not making enough pressure, system is leaking, or gas port diameter is too small. That is assuming that the mag locks back the bolt when the action is manually operated
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Old 08-28-2017, 10:04 PM
mcap1655 mcap1655 is offline
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The gas port in my M&P 10 was enlarged to 0.077" (was 0.068") to correct an intermittent cycling issues the rifle was experiencing with 7.62 Nato ammo. Have since replaced the gas block with a low profile and haven't had any issues since.

Not very helpful for 6.5 creedmoor but that's my experience...
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Old 08-28-2017, 11:25 PM
cclark89 cclark89 is offline
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Then it is short stroking. Either ammo is not making enough pressure, system is leaking, or gas port diameter is too small. That is assuming that the mag locks back the bolt when the action is manually operated
Thank you. I'm going to double check the gas block and tube alignment. Also make sure the gas rings are staggered. Then run it pretty wet this weekend when I take her out. The rifle really only had a couple hundred rounds through it before the update. May just need to be broken in a little. If it's more of the same then I'll start some more intensive troubleshooting.
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Old 08-29-2017, 01:41 AM
MistWolf MistWolf is offline
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Check the gas key as well.

Don't worry about staggering the ring gaps. It won't hurt anything to do so, but it won't help either
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Old 08-30-2017, 12:57 AM
cclark89 cclark89 is offline
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Gas block/tube may have been ever so slightly off. Straightened em up, made sure they're nice and snug. Lubed up the bolt like it was in for a wild night between the sheets. Hopefully thats it, if not I may see about lightening the buffer/spring. Regardless, Getting out this weekend to really stretch out her legs. Hopefully pop my 1,000 yd cherry!
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Old 09-02-2017, 09:13 AM
cclark89 cclark89 is offline
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Quote:
Originally Posted by MistWolf View Post
Then it is short stroking. Either ammo is not making enough pressure, system is leaking, or gas port diameter is too small. That is assuming that the mag locks back the bolt when the action is manually operated
It must have been the gas block being out of alignment. realigned it and lube up the bolt real good and she ran like a champ. Did 1,000 without breaking a sweat. Hit at 1,500 and was all around it at a mile.
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Old 04-14-2018, 06:23 PM
Small Holes Small Holes is offline
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I have a mp10 barrel, bolt, cam pin and firing pin w spring for sale. 16inch heavy barrel .308 with R5 rifling 1-10 twist and threaded. borescope says it is in great condition. 150.00 417-239-5392 thx
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Old 05-02-2018, 07:29 AM
masakari masakari is offline
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Has anyone had luck contacting S&W for a new barrel? I'm considering getting one, 18" lightweight. Mine was having cycling issues with 7.62x51 when it was new, so I opened the gas port from. 068" to .073" (at least that's what the gunsmith claims) but now it appears to be overgassed. I'm getting a ton of cycling and ejection issues. I have tried an XH buffer and spring, new extractor spring, adjustable gas block, and it's still jamming with live rounds and spent brass in the chamber. Very annoying.
So I'm considering trying again with a new barrel.
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Old 05-15-2018, 10:53 PM
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Gischileu Gischileu is offline
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I haven't been back here in a while, but thought I'd leave an update. I followed the general guidance from jrabenius and replaced the S&W barrel with an 18" fluted stainless steel barrel from the fine folks at Juggernaut Tactical, along with one of their nickel-boron coated BCG packages. I went with an adjustable gas block (nearly every AR308 is way over-gassed), and my favorite Troy aluminum hand guard and lots of squid grip inserts. I capped the barrel with a threaded muzzle brake from SilencerCo. I replaced the charging handle with an ambi model, and kept the rifle length buffer tube and Luth-AR stock. I've put a hundred and twenty rounds through the rifle (without playing with the gas block yet). Results? The heavier barrel has brought my group sizes down from 1.5"+ at 100 yards to a consistent 1" or so with decent ammunition (Nosler 165 grain BT Ballistic Tip). Zero FTF or FTE so far with the Nosler .308 commercial 165 grain Ballistic Tip, the 147 grain Federal Surplus FMJ, or the PMC Bronze 147 grain FMJ ammunition.

What's next? I want to try the range again with some Federal Gold 175 grain SMK's. A friend has been telling me it's the most accurate factory load for his M&P 10 - and he's using the same barrel I am. Figure it's worth a shot before screwing around with tuning the gas block.

Was it worth it? That depends on how you frame the question I guess. I'm much happier with an M&P 10 that is DPMS pattern and can use similar DPMS pattern aftermarket components as my other AR308. It is a lot of money - and will probably cost even more if I go ahead with a plan to install a 2 stage Geisselle trigger. The rifle works beautifully, and with a bit more work might make it to a sub-MOA rifle with the application of time, effort and, of course, more money. How you answer that question is going to be up to you.

Regards;

Rick
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