I can't believe this choke is still here for the way that choke shoots in my 870 and for that price. Guys that choke should light it up with Hevi-13 3.5" loads of #7's. You will be hard pressed to find one that shoots any better. You won't find that choke any cheaper.
Look what that brand of choke(Rem Choke) for my 870 did. And that is only a 3" load.
Here's the 20".
That choke should like I say SING!