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Yugo M72 Black Nitrided RPK Barrel 21.5" with 1 in 10 twist. 14-1lh muzzle threads.
These are made from 4150 steel and have the handguard retainer cuts and the extractor clearance cuts as well as the cooling fins.
Stamped USA 7.62 Gas port is NOT drilled.
This item is made in the United States and counts as a 922r compliant part.