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Crow Hunter · October 22, 2012, 03:56 PM

If it is a Colt, it is most likely a 5.56 chamber.

Even their "target" rifles have 5.56 chambers. (Modern ones anyway)

I wouldn't worry about it.

Worst thing that would happen if you shoot high pressure 5.56 in a tight .223 chamber is you "pop" a primer back into the trigger group and it locks up your trigger.

It won't blow up or anything, there isn't that much pressure difference between them.

October 22, 2012, 03:56 PM	#2
Crow Hunter Senior Member Join Date: January 27, 2012 Posts: 1,078	If it is a Colt, it is most likely a 5.56 chamber. Even their "target" rifles have 5.56 chambers. (Modern ones anyway) I wouldn't worry about it. Worst thing that would happen if you shoot high pressure 5.56 in a tight .223 chamber is you "pop" a primer back into the trigger group and it locks up your trigger. It won't blow up or anything, there isn't that much pressure difference between them. __________________ I am no longer participating in gun forums. Good luck.