I got this from Gamliel shooting supply, I think it cost about $40 new, you just clamp it onto the mag tube of any 12 ga shotgun, adds weight and the mercury helps to reduce recoil with inertial damping. Works very well, used it on the Benelli M4 I have up for sale on GA.
Trades Accepted: No
Just a collector trying to thin things out. If you call and I am not there, just leave a message and I'll get back to you. Contact me for more photos. Thanks for looking, Mark