I just purchased this bayonet cause I thought it would be funny to have a 17" bayonet on a 16" barreled M4. I knew the bayonet wasn't going to be high quality, even with S&H it was under $20, I just wanted it for the chuckle factor. Only problem is when I got it, the muzzle ring wouldn't even fit over the flash hider! So now I have a real crappy knife that really isn't good for much. Although i thought it kind of reminded me of a Roman gladius, so it might have some usefulness after TSHTF. I might try to see what a machine shop would charge me to properly drill the hole to the correct dimensions, but I really don't want to spend much more on it.