Not to mention that the Mk. 1 Carbine has the 3/8th " Dovetail on the top whereas the pistol does not..
But otherwise they should (like mystery has stated) be identical.. The little extra pamphlet for the Mk. 1 parts just lists the extra parts (foregrip, screws for said item, long barrel, different muzzle from what I can tell, and the upper reciever)
But yeah: What did you do to the gun to fubar it up? It's a pretty hard gun to screw up (unless you tried getting the trigger mechanism out)
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