Semi automatic bolt kit for the MP-40 or FBP

The bolt will accept an original extractor and cocking handle for an authentic look.

This kit comes with a build guide and includes the following parts: semi auto bolt, standard AR-15 firing pin, roll pin, firing pin spring, bolt stop, guide rods, and 2 sets of springs.

You may need additional USA made parts to be 922R compliant. This design is based on our ATF approved STEN MK3 model.

Note: This kit has a skill rating of 4 out of 5. The builder will have to engineer their own disconnector and sear for this to work as the original guns did not have them. The sear location and safety hook location may have to be relocated.