5.56 x 44 mm

Mike camp · #1 07-13-2015, 09:37 PM

My AR15 sport is stamped 5.56 on the barrel . Will the ammo marked with the 44mm on it work ? I see this on the shelves but not sure if it's ok to use

Doug M. · #2 07-13-2015, 10:19 PM

Don't you mean 5.56X45? I am not familiar w/a 5.56X44 round. A milspec AR has a chamber for the 5.56X45; some lower tier manufacturers cut them for .223 and sleazy ones mark them 5.56X45. Depending on the manufacturer, it may be appropriate to get the chamber reamer from Ned Christiansen. I was at a Dean Cuputo class in 2008 and saw one used; many of the rifles in attendance were too tight and the reamer opened them up. Try googling "The Chart" for AR rifles and you might see some interesting info.

Mike camp · #3 07-14-2015, 10:16 PM

Quote:

Originally Posted by Doug M.

Don't you mean 5.56X45? I am not familiar w/a 5.56X44 round. A milspec AR has a chamber for the 5.56X45; some lower tier manufacturers cut them for .223 and sleazy ones mark them 5.56X45. Depending on the manufacturer, it may be appropriate to get the chamber reamer from Ned Christiansen. I was at a Dean Cuputo class in 2008 and saw one used; many of the rifles in attendance were too tight and the reamer opened them up. Try googling "The Chart" for AR rifles and you might see some interesting info.

Yes I ment 5.56 x45 , thanks for the info I'll look this up