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GunHub Folks,

I have two O3A3 barrels. They both have stampings on the barrel about 6-7 inches down from the receiver.

A 4 groover (8-43) with the stamping: lUN.

A 2 groover (10-43) with the stamping: XlZU.

I'd sure like to know what these stampings mean - can't seem to find any info on this.

Thanks all,

Compensator
 
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