Semi automatic bolt kit for the STERLING MK4

This kit is based on our proven Sten bolt design and is built around our reduced diameter tube (STRL-SAT) and Mk4 barrel (STRL-B16). The barrel includes reduced diameter bushings and a length of 16”, keeping your build simple and carbine length.

This kit comes with a build guide.

You may need additional USA made parts to be 922R compliant. A barrel extension does not come with this kit. You will have to obtain a 16" barrel, or submit the required paperwork to the ATF before beginning. This design has been approved by the ATF.

Note: MIG or TIG welding is required for assembly.