Longer barrels can only give you a nominal increase in velocity. Replying to: A stupidQuestion:Is it possible to swap the standard barrel of a M16with a heavy -- Mao Clone Post ReplyForum Canis Majoris 11/07/2017, 15:52:17 Author Profile | Edit Certainly not enough to get anywhere close to the stopping power of a 7.62x51mm. Recommend | Alert | 5 4 3 2 1 0 -1 -2 -3 -4 -5 Where am IGo Up Go TopPost ReplyBack