"Ok so first, I'd like to say that this is a decent mag, but in comparison to other mags in this price range, its great. This is good for someone who wants to assume a sniper role, or more of a mid range/ defense role because of the ability to use it with a bipod effectively. Should fit in any TM compatible m4 mag wells. Medal except for the top part. My only design complaint is the door for filling is made of very thin plastic. looks very flimsy. feed well though!"