Those are the sole copy handguards which have minimal hex headed screws that hold the heat shields in place. The reproduction Colt handguards even have rivets (just like the genuine point) Keeping the warmth shields in place. Personally, I would not use a drill press. It could be carried out, https://hectordhfvq.bloggazza.com/30507064/top-guidelines-of-colt-combat-unit-rail-gun-45