The preponderance of 2nd order/3rd block A4's will have two groove barrels and scant stocks. Origninally they would have been equipped with M73B1 telescopic sights most likely the variation with stamped nomenclature, The Weaver name and addrress and the resettaabke zero scales on the w&e knobs.
Also look for factory inspection and ordnance acceptance stamps on the left side of the stock just above and behind the trigger (RA, Ordnance Escutcheon, FJA) a "P" proof mark in a 7/16" circular surround on the stock grip or wrist, at least five sub-inspectors marks on the bottom of the stock forward of the magazine box assembly and a Maker's mark in the cutoff notch (most often an upside down "K").Information
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