That choke does well in my 12 gauge 21" barrel 870-seems to throw up some of the more consistent numbers and patterns with a few different loads. That choke didn't do as well in the Mossy 835 or 500 versions as other options. Also, in my 20 gauge 870 several other chokes outperform it. I've spent way too much money on chokes, but the curiosity always gets me.