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Hi my name is Joe . I have 5 Colt AR15 that where bought during the Brady Bill era. There is a metal block directly behind the Hammer and above the selector lever in the lower and on top of block is stamped Colt. These rifles where heavily shot . I bought 5 new BCG AR 15- M16 and they are not the same . Can i take this block out with out damaging the rifle ? Is it Legal to take this Block out ?