HBAR ammo question

[gdubyacobb]

I have looked around this forum and others for info on .223 vs. 5.56 ammo for ARs, and understand that the rule of thumb is .223 in a 5.56 but not 5.56 in a .223.
My Colt is stamped 5.56 on the barrel but the lower is stamped CAL. 223.
So...?

 

[boricuamaximus]

if the barrel is chambered in 5.56 then you're good to go. many of the lowers say .223 because some countries will not allow the sale of a weapon stamped 5.56 NATO.

 

[gdubyacobb]

Thanks.
That kind of goes along with my thinking that it says 223 because it is a match competition model.

 

[hole punch]

i'm sure there's plenty of AR owners out there who's lower says "5.56" but the weapon is actually chambered in some other caliber like 6.5 or 6.8

 

[Diesel Kinevel]

there was an article in American Rifleman a few months ago about this. It states you can fire a .223 out of a 5.56 but not the other way around. "Military" ammo (5.56) is supposed to have greater chamber pressures than the safe working load of a .223 chamber.

 

[boricuamaximus]

A 5.56 chambered weapon is good just for that "what if I find 1500 rounds of surplus 5.56 fot $150" scenario.

 

[Kevmo]

A 5.56 chambered weapon is good just for that "what if I find 1500 rounds of surplus 5.56 fot $150" scenario.

WHAT?!?!

where and how to buy?... kthxbye