I have to say that many years ago I did something similar to a polish carbine version. It had very little rifling left (which probably helped). Most of the torture test involved first filling the barrel with obstructions and then hammering the barrel into the ground. We went through the whole packet of military and then started on some hot .308 loads (yes they will chamber and fire but don't recommend trying). Eventually a locking lug failed. Impressively strong auction.
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