I just purchased my first AR, a Colt AR-15 A2 Gov't Carbine manufactured in 1996 (according to Colt). I'm still a little nervous about the .223/5.56 issue. The barrel is marked 5.56 Nato 1/7, has the the double feed ramps. All the parts are C marked. Would I be okay shooting XM855 LC1AC1 Lake City Green Tip? I found some for a pretty good price, but the green tip stuff has mixed reviews and I'm still not sure about shooting 5.56 at all.
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