Upgrades for Compliant barrel

[Tommasini]

I'm a proud owner of a great shooting, super performing Model 811310 M&P10 Compliant firearm. I've owned the M&P now for about 3 years and haven't had any of the issues that some of the owners on here have experienced. After purchasing the M&P I outfitted it with dark earth MAGPUL CTR Carbine Stock, handguard, PMAGs and a Timney AR10 competition trigger #607. The weapon is topped off with the Nikon ProStaff scope and M-308 mount. I load my own ammo and use it primarily for hunting whitetail deer. I shoot consistent .5 groups at 100 yards without issue.

I do however have 2 issues with the M&P, follow-up shots and carry weight.

My questions are as follows:
1. The 811010 comes from the factory with the heavy barrel that's not threaded. My goal is to have the barrel threaded for a compensator. I think this will improve accuracy and follow-up shots. Is this possible?

2. I want to free float the barrel also. Has anyone on the site had any experience with free floating the heavy barrel on the 811310 compliant model?

FYI- For all the hand loaders out there I've had excellent results with Nosler brass, Hornady 150 gr SST bullets, WLR primers and 42.0 gr of IMR-4895 powder. Of all the loads I've tried this one offers the most accuracy without all the wear and tear. Prior to loading my own rounds I shot the Hornady Whitetail ammo with the 150 gr Interlock SP with excellent results as well.

Thanks in advance and happy shooting!

 

[bergermeister]

May want to rethink the WLR primers: http://smith-wessonforum.com/smith-wesson-m-p10-rifles/443320-pitting-bolt-face.html

 

[sgtsandman]

It depends on the muzzle brake. Some will have more noticeable effects on muzzle rise and/or recoil than others depending on the design and what you are more interested in it doing.

I don't know enough about the heavy barrel dimensions to venture any suggestions for you. I also don't remember reading about any limitations on selection because of it. If you are looking to get a hand guard that will cover the gas block, the gas block will need to be a low profile one. They do make shorter free float hand guards if you wish to avoid changing out the gas block.

 

[Tommasini]

The barrel is 18" and .750 diameter. I'm would like to free float it so yes I will need a low profile gas block. My biggest concern is in getting the barrel threaded. I was hoping to find someone that has experience with it in the forum here. I have found that it is always better to do your homework first. "Prior preparation prevents poor performance, measure twice, cut once!"

I checked all my firearms in addition to the m&p for fouling from using the WLR primers and found nothing. I use Nosler brass and check every load that I develop for pressure signs. The Hornady load book has an excellent chapter on gas pressure and the signs of over pressure that I'm very familiar with. I take very good care of my firearms and pay particular attention to this while formulating my loads for various caliburs. Thank you

 

[sgtsandman]

Unless you are a machinist, I would look at having a gunsmith or machinist thread your barrel for you. While you are at it, you may want to look at getting the crown worked so it has a 11 degree cone to it. I can't remember sure sure but I think the crown on my standard barrel has a flat profile. An 11 degree crown is reputed to be more accurate, even with a muzzle device installed.

 

[broylz]

I had my compliant barrel chopped to 16.25" and threaded. Installed a saker trifecta brake on it. Mine was the camo hunting model. I swapped out the fixed stock for a bcm m4 buffer tube, noveske qd end plate and added a od ctr. I run a kit from heavybuffers.com in it for the spring and buffer.

I got mine lightly used with a troy low profile gas block installed and a 15" troy alpha handguard. Shoots great. Only minor complaint is that the handguard is an armalite pattern and the rails don't line up on top. I will eventually replace it with a slr solo lite 14" version

 

[copemech]

Primary Arms is running all the popular 308 handguards at 15% off right now!

Requires DPMS LOW profile!

 

[Engine Earl]

I have come to prefer the non-threaded barrel end.

Diamondhead USA VRS T-308L 13.5" (Low profile) & Geissele LOw Profile Super Gas Block

 

[davkenrem]

I have done everything you asked about and chronicled it on video. I bought the compliant model specifically for the heavier barrel.

https://youtu.be/7syeUCnSkBY

https://youtu.be/H5ApvGJNo4E

https://youtu.be/GrOPvxLloXo


I tried a brake and comp from Griffin Armament, both taper mount for their cans, brake worked better than thier comp. The can works better than either for follow up shots. Highly reccommended.