HOLY DIVER
Member
just got done building my new upper, and i have a issue with the feed ramps (i think). The barrel extension and upper reciver have m4 ramps.i chambered a round and ejected it and it had a pretty bad looking scar on the bullet it self. i'm thinking i need to remove the barrel and polish the 2 lug slots in the feed ramps?. i wanted to get some opinions before i started