And for whoever is bickering about barrel markings, the Colt reissue shouldnt have forge codes around the FSB so theres a major seen fuck up correct there. Personally, I would not use a drill press. It may be carried out, but I might go the router or mini mill route. https://afundirectory.com/listings12976634/5-essential-elements-for-colt-m16a1-for-sale