This device is designed specifically for the Mossberg 500 12ga. It simply attaches to the Take Down Screw giving you a cost effective, breaching / standoff device.
Your Take Down Screw needs to be the newer version, 1" in diameter x 3/8" thick with a threaded swivel hole in the middle.
This device is designed to fit a Mossberg 500 with an equal length barrel to mag tube ratio, such as commonly found on Mossberg 500's with a 20" barrel.
Machined from 1144 Stressproof steel and plated black, may exhibit some signature marks or imperfections.
It will come with all assembly hardware, including a 1.0 ml package of VC3 Threadmate, and installation instructions.
All you'll need is a phillips screwdriver.
Dimensions are as follows:
An OAL of 2.328". A working length of 1.921" from the face of the take down screw to the tips of the teeth, and an OD of 1.250. Dimensions are approximate.