Shotgun tracer to mount on a TM M870 Breacher.
Fits tight over the barrel and shelltube-screw.
Off course, you have to get the tube, electronics, tracer, to work with this.
This design is made for the TM tracer models. (not the B&T)
Check the 'Shotgun Tracer: Making off' photo album on https://www.facebook.com/blarock86cd to see how to make it.
I only ask to leave the design as it is. No modifications. Off course, you can design your own base for different shotguns, or make another kind of tracer-support.