The Stryker 51’s start out life as a Cetme kit, an HK Parts Flat and a RIM Country Mfg 51 barrel.
We modify the bolt carrier and shorten the Cetme cocking tube. The cocking support is a lengthened Cetme cocking support. It is lengthened by using the nose from the bolt carrier then cut to fit with the shortened bolt carrier. The recoil assembly is shortened up to function with the shortened bolt carrier.
A little welding, some finish work and you’ve got a nice .308 “pig gun.”