I have this carbine on a couple U.S.A. SKS forums. This is the only ONE documented with pictures. There is a lot of debate whether this was original or parts scrubbed. Slowly they are coming around that this could be original. The thing is that I need is other 50's with spike documented with pictures to help authenticate my carbine. The stock ferrule is one of the important clues that carbine was made for a spike. It also needs 90 degree gas port, engraved date (1950r), hand stamped tula star, eyelet latch pin and spring loaded firing pin.