Military issue 5.56 in a civilian .223 weapon?

[dukefan70]

I've heard that military grade 5.56 ammo has a higher pressure load and therefore should not be used in .223 remington rifles.

1. Is this true?

2. If so, does it hold true for civilian ARs and other commercially sold military style "assault weapon" rifles chambered in .223?

 

[B00m Stick]

.223 in 5.56 won't cause problems but may not perform optimally. 5.56 in .223 may cause problems if the rifle is not designed to fire both loads.

Check here for more info: http://www.winchester.com/lawenforcement/news/newsview.aspx?storyid=11

And check with your rifle mfg.

 

[CoRoMo]

This is one of those topics that have been whipped into dust.

http://www.thehighroad.org/archive/index.php/t-289906.html
http://www.thehighroad.org/archive/index.php/t-309191.html
http://www.thehighroad.org/showthread.php?t=347187.html
http://www.thehighroad.org/showthread.php?t=413532
http://www.thehighroad.org/showthread.php?p=5081635

 

[dukefan70]

thanks

 

[bpl]

Check to see what is stamped on your barrel. Most civilian ARs are stamped 5.56 and can shoot both 5.56 and .223 just fine. If the barrel is stamped .223, I wouldn't shoot 5.56 ammo in it, at least without confirming with the manufacturer that its ok.