Smith & Wesson Forum

Go Back   Smith & Wesson Forum > >


Reply
 
Thread Tools Display Modes
  #1  
Old 07-23-2018, 01:56 PM
LiberalTears LiberalTears is offline
Member
MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224?  
Join Date: Jul 2018
Posts: 1
Likes: 0
Liked 0 Times in 0 Posts
Question MP15 .223 to .224?

I own an MP-15 chambered in .223. I was wondering if I can convert it to .224 myself. If I can, how would I go about doing so?
~LiberalTears
Reply With Quote
  #2  
Old 07-23-2018, 09:40 PM
Westie1's Avatar
Westie1 Westie1 is offline
Member
MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224?  
Join Date: Jul 2016
Location: Sacratomato
Posts: 318
Likes: 59
Liked 250 Times in 138 Posts
Default

You're already firing a .224 diameter bullet, so no mods are necessary. If you meant 224 Valkyrie, then a whole new complete upper plus mags would be needed.
__________________
Peace was my Profession

Last edited by Westie1; 07-23-2018 at 09:44 PM.
Reply With Quote
The Following User Likes This Post:
  #3  
Old 07-24-2018, 01:58 AM
hdwhit hdwhit is offline
Member
MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224?  
Join Date: Sep 2016
Location: North Texas
Posts: 775
Likes: 77
Liked 462 Times in 284 Posts
Default

.223 Remington, also known as 5.56 x 45 mm in military guise, is actually firing a projectile with a 0.224 diameter.

You should already find abundant stocks of .223 Remington or 5.56x45 ammunition (both should be treated as interchangeable as your rifle is chambered for 5.56).

If you are asking this question because you are considering getting into reloading, then please note that this question indicates your need to obtain and study at least one, possibly two or three reloading manuals and then read - no, study - the section at the front on "How to Reload".
Reply With Quote
The Following User Likes This Post:
  #4  
Old 07-25-2018, 05:43 PM
Rastoff's Avatar
Rastoff Rastoff is offline
Member
MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224?  
Join Date: Dec 2011
Location: So Cal (Near Edwards AFB)
Posts: 13,062
Likes: 2,132
Liked 13,241 Times in 5,253 Posts
Default

Are you talking about .224Valkyrie?
__________________
Freedom isn't free.
Reply With Quote
  #5  
Old 07-25-2018, 06:00 PM
F75gunslinger's Avatar
F75gunslinger F75gunslinger is online now
Member
MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224?  
Join Date: Oct 2014
Location: South of Rochester , NY
Posts: 814
Likes: 43
Liked 795 Times in 349 Posts
Default

Quote:
Originally Posted by LiberalTears View Post
I own an MP-15 chambered in .223. ~LiberalTears
Quote:
Originally Posted by hdwhit View Post
Both should be treated as interchangeable as your rifle is chambered for 5.56.
I don't know if the mp-15 is available chambered in both .223 and 5.56, but these rounds are not interchangable.

A rifle chambered in .223 with a tight chamber will lose accuracy and reliability shooting 5.56. A rifle chambered in 5.56 will shoot both,although I don't know how accuracy is affected.
__________________
1st smiles,lies.Last,gunfire.
Reply With Quote
  #6  
Old 07-25-2018, 06:02 PM
Rastoff's Avatar
Rastoff Rastoff is offline
Member
MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224?  
Join Date: Dec 2011
Location: So Cal (Near Edwards AFB)
Posts: 13,062
Likes: 2,132
Liked 13,241 Times in 5,253 Posts
Default

Quote:
Originally Posted by F75gunslinger View Post
A rifle chambered in .223 with a tight chamber will lose accuracy and reliability shooting 5.56.
This is the internet myth and is wrong.
__________________
Freedom isn't free.
Reply With Quote
  #7  
Old 07-25-2018, 06:10 PM
F75gunslinger's Avatar
F75gunslinger F75gunslinger is online now
Member
MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224?  
Join Date: Oct 2014
Location: South of Rochester , NY
Posts: 814
Likes: 43
Liked 795 Times in 349 Posts
Default

Quote:
Originally Posted by Rastoff View Post
This is the internet myth and is wrong.
And yet strangely my AR chambered in .223 becomes a single shot and 100 yard groups go from less than an inch to over 6 inches when using 5.56.
__________________
1st smiles,lies.Last,gunfire.
Reply With Quote
  #8  
Old 07-25-2018, 07:24 PM
cyphertext cyphertext is offline
US Veteran
MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224?  
Join Date: Feb 2012
Location: Wylie, TX
Posts: 4,256
Likes: 949
Liked 3,297 Times in 1,809 Posts
Default

Quote:
Originally Posted by F75gunslinger View Post
And yet strangely my AR chambered in .223 becomes a single shot and 100 yard groups go from less than an inch to over 6 inches when using 5.56.
What AR do you have that is chambered in .223?
Reply With Quote
  #9  
Old 07-25-2018, 07:42 PM
dusty3030 dusty3030 is online now
SWCA Member
MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224?  
Join Date: Feb 2003
Location: Memphis, TN o
Posts: 521
Likes: 567
Liked 869 Times in 280 Posts
Default

I'd get a kit to get the headspaced bolt / barrel combo. You just need the barrel and bolt everything else beside mags is the same.
You'll also need 6.8SPC type mags for best reliability.

PSA 20" Rifle-Length .224 Valkyrie 1/7 Stainless Steel Barrel & BCG Combo - 5165447820
__________________
Straight shootin'
SWCA#2439
Reply With Quote
  #10  
Old 07-25-2018, 08:06 PM
F75gunslinger's Avatar
F75gunslinger F75gunslinger is online now
Member
MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224?  
Join Date: Oct 2014
Location: South of Rochester , NY
Posts: 814
Likes: 43
Liked 795 Times in 349 Posts
Default

Quote:
Originally Posted by cyphertext View Post
What AR do you have that is chambered in .223?
Before i knew what I know now I had a guy build me one with a long heavy barrel for varmint hunting.He asked me if I wanted 5.56 or .223 since his preferred barrel choice for quality/price had both ( ER Shaw ).

Since then I have built another upper chambered in 5.56 to get a little more use out of the gun just shooting at the range..
__________________
1st smiles,lies.Last,gunfire.

Last edited by F75gunslinger; 07-25-2018 at 08:09 PM.
Reply With Quote
  #11  
Old 07-26-2018, 09:07 PM
Rastoff's Avatar
Rastoff Rastoff is offline
Member
MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224?  
Join Date: Dec 2011
Location: So Cal (Near Edwards AFB)
Posts: 13,062
Likes: 2,132
Liked 13,241 Times in 5,253 Posts
Default

Quote:
Originally Posted by F75gunslinger View Post
Before i knew what I know now I had a guy build me one with a long heavy barrel for varmint hunting.
OK, if you have a precision made .223Rem chamber then I could see a difference. The shoulder of the 5.56x45 is slightly different. In a precision made chamber it could cause accuracy issues. Going from <1MOA to >6MOA seems extreme, but all guns are different. Most will not have issues like that. Maybe your chamber is tighter/looser than normal?

Also, turning into a single shot is weird. The chamber shouldn't affect that at all unless the cartridge is getting stuck. Or the chamber is so loose that a bunch of the gas is escaping past the casing as it's fired. That doesn't seem possible because the 60,000psi would just expand the brass enough to seal it up.

I don't know. You're the first I've ever heard of to have this issue.
__________________
Freedom isn't free.
Reply With Quote
  #12  
Old 07-27-2018, 02:48 AM
F75gunslinger's Avatar
F75gunslinger F75gunslinger is online now
Member
MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224?  
Join Date: Oct 2014
Location: South of Rochester , NY
Posts: 814
Likes: 43
Liked 795 Times in 349 Posts
Default

Yeah, the cartridge is getting stuck...I usually have to tap it out with a cleaning rod. It isn't an every shot thing, maybe half the time or a little more ? But between the reliability issues and the accuracy I just stick with .223 for that upper. The 5.56 upper doesn't seem to care either way,although I haven't shot much .223 out of it to see how it effects accuracy.
__________________
1st smiles,lies.Last,gunfire.
Reply With Quote
  #13  
Old 07-27-2018, 11:51 AM
WR Moore WR Moore is offline
Member
 
Join Date: Oct 2006
Posts: 3,373
Likes: 123
Liked 1,426 Times in 823 Posts
Default

There are some minor differences in chamber dimensions between .223 and 5.56 mm. The major change is in freebore and leade (sometimes called throat) angle. The 5.56 mm chamber has a longer freebore and a more gentle angle on the leade.

If you had a tight chambered .223 and fired 5.56 mm in it, you might see some signs of excessive pressure if the 5.56 was actually loaded to max average pressure. You should see signs of that on the primer. I've got a minimum chamber .223 bolt gun that shows no signs of excessive pressure (relative to the same ammo fired in a 5.56 mm chamber) with 5.56 mm ball.

If your functionality is right on the ragged edge, the extra extraction effort might cause the problem you're having. I'd suggest installing a new correct extractor, extractor spring and insert. Possibly add a D ring to the extractor. Then try again.

The only thing I can think of off the top of my head that might cause your change of group size would be rifling twist that doesn't match up with your 5.56 mm ammo. Or some massively out of spec ammo.

Last edited by WR Moore; 07-27-2018 at 11:53 AM.
Reply With Quote
  #14  
Old 07-27-2018, 05:33 PM
F75gunslinger's Avatar
F75gunslinger F75gunslinger is online now
Member
MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224? MP15 .223 to .224?  
Join Date: Oct 2014
Location: South of Rochester , NY
Posts: 814
Likes: 43
Liked 795 Times in 349 Posts
Default

Thanks for the input, but honestly not worth it to me. The upper chambered in .223 feeds,fires, and ejects fine with .223. Only when I go to 5.56 do I have issues. So I'll just stick to the .223 ammo for that upper.
__________________
1st smiles,lies.Last,gunfire.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Does anyone have the MP15-22 PC? stmry Smith & Wesson M&P 15-22 25 01-28-2014 06:28 AM
Came across a MP15 Sport and MP15 MOE today. MauiWowwee Smith & Wesson M&P15 Rifles 5 05-13-2013 09:33 AM
My S&W MP15-22 is on its way swopeti Smith & Wesson M&P 15-22 12 09-26-2011 09:00 AM
cleaner for mp15 and mp15-22.... mr2005 Smith & Wesson M&P15 Rifles 8 02-23-2011 08:32 AM
hardcase for the mp15-22 and mp15 mr2005 Smith & Wesson M&P 15-22 9 07-23-2010 03:57 AM

Powered by vBadvanced CMPS v3.2.3
smith-wessonforum.com tested by Norton Internet Security smith-wessonforum.com tested by McAfee Internet Security

All times are GMT -4. The time now is 11:15 AM.


Search Engine Optimisation provided by DragonByte SEO v2.0.42 (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
S-W Forum, LLC 2000-2018
Smith-WessonForum.com is not affiliated with Smith & Wesson Holding Corporation (NASDAQ Global Select: SWHC)