Recently purchased what was advertised as, and appears to be a KKM target rifle. The 1964 version manual I have downloaded shows two trigger adjustment screws inside the triggerguard, 1 for weight and 1 for slack, but my rifle has a third screw in front of the triggerguard. Serial # is 633XX. Any help on where to find info and parts? I need the sling swivel for the handstop, and the spring pin for the safety. (and the trigger slack adjustment screw a prior owner buggered 
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