On my 870 Express super mag,The STARDOT outshot a Kicks,Madmax,H.S.Undertaker,and factory full choke.And it only costs about $20 bucks.My friend has one on his 835,and loves it also.I met a guy that worked for Stardot he was selling them at the Perry Buckarama,he was from Alabama where the company is based.He said the choke is also compatible with Hevi-Shot.He said they were working on a deal with Gander Mountain.I got mine from Walmart,but they have quit carrying them.I don't know why.They carry mostly Remington Factory,tru-glo,and HS chokes now.