Midwest Industries stock tube adapter was designed to allow the mounting of a Mil Spec stock or SB brace to weapon platforms with a piece of picatinny rail on the rear. The design of this tube allows for a very minimal additional length and only adds 7/16th of an inch from the back of the rail to the front of the brace or stock.
Because this tube does not need to contain a buffer or spring we have made the body of the tube into a water tight storage compartment.
This tube weighs 7.5 ounces and is made of 6061 aluminum.
Like everything we make it is made in the USA and backed by our lifetime warranty.

https://www.midwestindustriesinc.com/Stock-Tube-Adaptor-Picatinny-p/mi-stap.htm

Enough that if it’s broke your gun is truly in bad shape. Take a good look at it and compare it to the others out there with a small detachable clamp. This is a much sturdier clamp method .

Troy

MI