This Bayonet knife and it's a really solid utility knife. The handle is very comfortable and the knife came very sharp. This Bayonet knife fits the AR-15, M4, M-16, and the Mossberg shotgun.I also heard it fits an AR-22 as well. Very awesome knife, full tang and you can see the tang just like the 498 Combat knife. The sheath is great and many places to mount the knife on your persn.