imfdb.org  

Go Back   imfdb.org > The Forum > Just Guns

Reply
 
Thread Tools Display Modes
  #1  
Old 02-02-2009, 02:47 AM
Yournamehere Yournamehere is offline
Senior Member
 
Join Date: Nov 2008
Posts: 912
Default M16 build.

I'm looking to make a semi auto M16/AR-15 build, preferably a retro A1 style build (since the actual M16A1s cost over 10 grand they are out of the question). Does anyone know of the ease of acquiring an A1 upper or lower, stripped or complete? Also, if your upper is safe for 5.56 (like an A1 upper) and your lower is .223 only (say an SP1 lower), is it safe to fire 5.56x45 ammo out of the gun? Any comments, advice or suggestions on M16s are welcome as well. Thanks.
Reply With Quote
  #2  
Old 02-02-2009, 05:46 AM
Nyles Nyles is offline
Senior Member
 
Join Date: Nov 2008
Posts: 917
Default

Your lower being in .223 makes absolutely no difference, all the lower does it house the mag, trigger mech and buffer spring.
Reply With Quote
  #3  
Old 02-02-2009, 08:21 PM
MT2008's Avatar
MT2008 MT2008 is offline
IMFDB & Forum Admin
 
Join Date: Nov 2008
Posts: 2,506
Default

Quote:
Originally Posted by Yournamehere View Post
I'm looking to make a semi auto M16/AR-15 build, preferably a retro A1 style build (since the actual M16A1s cost over 10 grand they are out of the question). Does anyone know of the ease of acquiring an A1 upper or lower, stripped or complete? Also, if your upper is safe for 5.56 (like an A1 upper) and your lower is .223 only (say an SP1 lower), is it safe to fire 5.56x45 ammo out of the gun? Any comments, advice or suggestions on M16s are welcome as well. Thanks.
Maybe my mind isn't working right (I'm operating on 5 hrs. sleep), but...5.56x45mm upper versus .223 lower? Huh?

If I were going to make an M16A1 look-a-like, I guess I would just mate an A1-style upper to a lower from any other AR-15, with the stock replaced replaced. I know I've seen A1-style uppers (with forward assist) before for sale at gun shows.
Reply With Quote
  #4  
Old 02-02-2009, 08:50 PM
Yournamehere Yournamehere is offline
Senior Member
 
Join Date: Nov 2008
Posts: 912
Default

I'm saying if you mate a 5.56x45mm upper with a .223 only lower, is it safe to fire 5.56x45 ammo out of the gun?
Reply With Quote
  #5  
Old 02-02-2009, 10:53 PM
Gunmaster45's Avatar
Gunmaster45 Gunmaster45 is offline
IMFDB Admin
 
Join Date: Nov 2008
Location: New York, USA
Posts: 1,779
Default

5.56x45mm is military metric. .223 Remington is in caliber inches. They are the same bullet all in all.
Reply With Quote
  #6  
Old 02-03-2009, 01:02 AM
Yournamehere Yournamehere is offline
Senior Member
 
Join Date: Nov 2008
Posts: 912
Default

I know that, but 5.56 is loaded to higher pressures, and is what the military uses in their guns. I'm saying if the lower half of the gun is for the lower pressure round (.223), is the gun safe to shoot without KBs?
Reply With Quote
  #7  
Old 02-03-2009, 01:04 AM
Gunmaster45's Avatar
Gunmaster45 Gunmaster45 is offline
IMFDB Admin
 
Join Date: Nov 2008
Location: New York, USA
Posts: 1,779
Default

I'd say it would work fine then, the difference isn't that drastic.
Reply With Quote
  #8  
Old 02-03-2009, 03:09 AM
MT2008's Avatar
MT2008 MT2008 is offline
IMFDB & Forum Admin
 
Join Date: Nov 2008
Posts: 2,506
Default

Quote:
Originally Posted by Yournamehere View Post
I know that, but 5.56 is loaded to higher pressures, and is what the military uses in their guns. I'm saying if the lower half of the gun is for the lower pressure round (.223), is the gun safe to shoot without KBs?
With the exception of the buffer tube, I can't think of any components in the lower receiver that would even be affected by higher pressure.

Anyway, I am not aware of any AR-15 lowers that are built specially for military-grade ammo and others built to handle civilian ammo (which isn't to say there's no difference between an M16 and an AR-15 lower, but those differences have to do with ability to fire on automatic, not ammo types).
Reply With Quote
  #9  
Old 02-03-2009, 03:09 AM
Nyles Nyles is offline
Senior Member
 
Join Date: Nov 2008
Posts: 917
Default

As I said earlier, no difference. It's safe to interchange the ammo anyways, and the lower is not a pressure-bearing part. Even if the upper is in a completley different calibre, the lower makes no difference as long as the mag fits - 6.8mm SPC upper, for example, fits fine on a .223 lower.
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. The time now is 11:57 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.