Papa, I picked up one of these Legion Vepr 12, and I see no difference in placement or size in the gas block holes compared to my previous Vepr 12 examples. All the markings on the barrel are identical as well in regards to length ( I realize there not though). How are the barrel holes configured on your Vepr?
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I don't work for Molot, and my assumption is based on that:
US V12 models has 19" BBL (482,6 mm) is very close to VPO-205-01 (ВПО-205-01) with 520 mm (20,47") BBL with Perm Attach FH , so actual BBL without FH is very close to US model). Have you gauged holes ID on