Just recently dragged out a 513T I purchased through the CMPicon. I never noticed before as I haven't shot the thing, but, the barrel has some (maybe 5 to 10 degrees) rotational "slop". I took the action out of the stock and the two pins holding the barrel to the reciever seem plenty tight. I'm wondering if there's an approved tightening method or should I peen or shim what looks like a key or dovetail on the bottom of the barrel. This is the first time I've had one of these apart and I'd like to fix it correctly myself. I've searched here and a few other sites with no results, even checked out the G.I. technical manual. So what's the deal?
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