Had one once on my very first 870.
I sent it to Poly-Choke when I was 15 yrs old....that was a long time ago.
It shot pretty well for what it was but the older I got the more I wanted a screw in choke and not that bulbous thing on the end of my barrel.
The one thing I remember I really liked about it was the bright orange bead they installed.
Something I quickly looked up
http://stevespages.com/NewManuals/PolyChoke/Poly%20Choke.pdf
