Vertical foregrip...
If you want the one in the midway usa add that Morgan posted... I one just like it on my ar, My only gripe is that it is not easy to move, and it needs to have a shim to make it tighten up properly. The thing is, you put it where it is going, and you should never need to move it again, that being said, I made shim out of a piece of plastic I had laying around, tightened it up and it hasn't moved since. It sure does make fast repeat shots easier to make.
If you want the one in the midway usa add that Morgan posted... I one just like it on my ar, My only gripe is that it is not easy to move, and it needs to have a shim to make it tighten up properly. The thing is, you put it where it is going, and you should never need to move it again, that being said, I made shim out of a piece of plastic I had laying around, tightened it up and it hasn't moved since. It sure does make fast repeat shots easier to make.