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Old December 14, 2012, 06:48 PM   #6
4V50 Gary
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Join Date: November 2, 1998
Location: Colorado
Posts: 21,823
Listen to Dfariswheel. He's a retired gunsmith.

If your gun has developed excessive headspace, it needs a trip to the gunsmith. Generally the barrel must be removed from the receiver. The receiver is then measured (distance from front of receive ring to bolt face) and distance from the receiver C-ring to the front of the receiver. You barrel shank may have to be turned down a bit to shorten the headspace.

Get the expended cases and examine them. Also inspect the fresh ones before you shoot them. Measure them for length and compare them to military specs.
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