And for whoever is bickering about barrel markings, the Colt reissue shouldnt have forge codes to the FSB so theres a giant seen fuck up proper there. Individually, I would not use a drill press. It could be performed, but I might go the router or mini mill route. There https://coltcombatunitrailgun4536934.techionblog.com/31293194/colt-m16a1-for-sale-fundamentals-explained