East Mountain Machine LLC has been providing quality kits at an affordable price for many years. Each kit comes with a complete set of parts. All kits include all parts necessary to complete your sten MK3 SMG parts kit into a closed bolt hammer fired semi-auto. Kit come with US Made parts, partially machined receiver tube with template, bolt with firing pin, hammer, barrel trunions, barrel extension, recoil assembly with springs, full build instructions and more. Semi-Auto Sten Kits Now Better than Ever East Mountain Machine LLC East Mountain Machine LLC strives to provide quality conversion kits and parts. Profile