Some time ago, I ordered a model1sales m4 upper with 1:9 twist chrome lined barrel and a 5.56 chamber. So how do I tell if it’s a 5.56 chamber? The barrel markings say M1S, HC, 1-9,
thanks
Posted: 4/21/2009 5:49:59 PM EDT
[#1]
anything....... hello.... is this working
Posted: 4/21/2009 6:14:22 PM EDT
[#2]
All of Model 1's chrome lined barrels are chambered for 5.56.
