To start: SSS may have re-cut the ramp, and re-worked the ball slot, this is a couple of things that is done in a T&T job. There was a change in the bolt bodies sometime in the early mid 2000's. They use a different cocking piece, and they are slightly different. The newer version is recessed in the back so that it can be used for both left handed and right handed actions. Prior to this they used two different bolt bodies depending if it was a right or left handed action.
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