So I got a CM16 a few months back and have been wanting to make a few changes. I have things in mind and need to know if the front end of the outer barrel, the bit with that horrible front sight, is interchangeable with the front end of other M4's. I've already figured out how it comes apart while practicing maintenance and trying to stop bits jiggling around, but I haven't got a clue if the front ends of the other combat machines, most notably the ones WITHOUT the front sight, are attached in the same way. If anyone could tell me which ones are, if any, that'd be great as payday is coming up and I really want to start making my gun look more the way I want it to.