I bought a Yankee Hill (stab them in the head type) just because it looked cool, and Midway had then on sell.
It is well made and does look cool(to me).

Can't really tell any difference on my 15/22. But it seems to work well with my M4.
Midway # 124-926. With shipping was ~$20.00.
Very easy to install. Suggest using a small drop of blue loctite, so it won't shoot lose.

Guy22