GlockTalk.com
Home Forums Classifieds Blogs Today's Posts Search Social Groups



  
SIGN-UP
Notices

Glock Talk
Welcome To The Glock Talk Forums.
Reply
 
Thread Tools Display Modes
Old 03-23-2013, 16:19   #1
Phantom465
Senior Member
 
Phantom465's Avatar
 
Join Date: Jul 2010
Location: Columbus, OH
Posts: 378
question on 5.56 and .223

From the info I have Googled, 5.56 and .223 are virtually the same size, but 5.56 usually has higher pressure. Is that correct?

With that in mind, what parts really matter when it comes to higher presser. Certainly the barrel needs to be rated for higher pressure. What are parts should I be concerned about?

thanks!
__________________
G30SF
Phantom465 is offline   Reply With Quote
Old 03-23-2013, 16:29   #2
flw
Senior Member
 
Join Date: Apr 2012
Posts: 357
Quote:
Originally Posted by Phantom465 View Post
From the info I have Googled, 5.56 and .223 are virtually the same size, but 5.56 usually has higher pressure. Is that correct?

With that in mind, what parts really matter when it comes to higher presser. Certainly the barrel needs to be rated for higher pressure. What are parts should I be concerned about?

thanks!
Rifle made for 556 will shoot 223 as well but not the other way around. 223 rifle will not shoot 556. There is a difference in the dimensions. You need to look at more than the caliber
flw is offline   Reply With Quote
Old 03-23-2013, 16:48   #3
WoodenPlank
Who?
 
WoodenPlank's Avatar
 
Join Date: May 2010
Location: NW Florida
Posts: 7,670
Quote:
Originally Posted by flw View Post
Rifle made for 556 will shoot 223 as well but not the other way around. 223 rifle will not shoot 556. There is a difference in the dimensions. You need to look at more than the caliber
Not exactly. A rifle chambered in .223 WILL chamber and fire a 5.56 cartridge, but it can result in an unsafe over-pressure situation that can damage the weapon and even possibly harm the shooter.

OP: The chamber needs to be a 5.56 chamber, or .223 Wlyde (A match chamber specifically designed to handle 5.56 ammo). If you are specifically looking at AR-15s, it has been a LONG time since I saw one that did not have one of those two chambers cut into the barrel.

Also, it's the marking on the BARREL that matter, not what's on the lower.
__________________
Never argue with an idiot. They will drag you down to their level and beat you with experience.

Last edited by WoodenPlank; 03-23-2013 at 16:50..
WoodenPlank is offline   Reply With Quote
Old 03-23-2013, 19:21   #4
Phantom465
Senior Member
 
Phantom465's Avatar
 
Join Date: Jul 2010
Location: Columbus, OH
Posts: 378
Quote:
Originally Posted by WoodenPlank View Post
OP: The chamber needs to be a 5.56 chamber, or .223 Wlyde (A match chamber specifically designed to handle 5.56 ammo). If you are specifically looking at AR-15s, it has been a LONG time since I saw one that did not have one of those two chambers cut into the barrel.

Also, it's the marking on the BARREL that matter, not what's on the lower.
Thanks - I am building an AR from the ground up. Are there any other parts that I should be concerned about? What about the bolt / bolt carrier or upper receiver?
__________________
G30SF
Phantom465 is offline   Reply With Quote
Old 03-23-2013, 21:08   #5
ked
Senior Member
 
Join Date: Feb 2007
Location: tennessee
Posts: 2,294
i understand about the 5.56 or .223 wylde chamber, but can you be more specific about what exactly causes the excessive pressure?

thanks, ked
__________________
if a man speaks, and there's not a woman around to hear him, is he still wrong ?
ked is offline   Reply With Quote
Old 03-24-2013, 06:38   #6
WoodenPlank
Who?
 
WoodenPlank's Avatar
 
Join Date: May 2010
Location: NW Florida
Posts: 7,670
Quote:
Originally Posted by Phantom465 View Post
Thanks - I am building an AR from the ground up. Are there any other parts that I should be concerned about? What about the bolt / bolt carrier or upper receiver?
Upper receiver doesn't matter, so long as it made to spec (ie: caliber doesn't matter, just has to be an AR-15 upper receiver). So long as the bolt is made for .223/5.56 (no difference between them for the bolt), and is from a quality manufacturer, you'll be fine. I am partial to Bravo Company, Daniel Defense, and LMT bolts (in that order, usually - consequently, that seems to be the order of availability).

For reliability, the two most critical parts are the barrel and bolt carrier group. As long as you buy quality on those, you should be fine. Accuracy will vary between individual builds, so the only way to know how accurate YOUR rifle will be is to get out and shoot it.

Quote:
Originally Posted by ked View Post
i understand about the 5.56 or .223 wylde chamber, but can you be more specific about what exactly causes the excessive pressure?

thanks, ked
A standard .223 chamber has a shorter leade than .223 Wylde or 5.56. Also, 5.56 cases have slightly smaller internal dimensions due to thicker case walls. Those two factors (tighter chamber and tighter internal case dimensions) contribute to higher chamber pressures. Bear in mind that this is all in GENERAL terms, as the exact dimensions can vary between production runs and manufacturers - sometimes dramatically.

Lucky gunner labs had a great write-up on the two a while back, and it's worth reading.

Their conclusion was that, while shooting 5.56 from a .223 chamber isn't likely to turn your gun into a bomb (although it CAN happen in certain situations), it can potentially cause some issues - popped primers, or greater wear over time.
__________________
Never argue with an idiot. They will drag you down to their level and beat you with experience.
WoodenPlank is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump




All times are GMT -6. The time now is 17:28.



Homepage
FAQ
Forums
Calendar
Advertise
Gallery
GT Wiki
GT Blogs
Social Groups
Classifieds


Users Currently Online: 1,218
371 Members
847 Guests

Most users ever online: 2,244
Nov 11, 2013 at 11:42