Brand new US Made Non-threaded muzzle SMG "9mm NATO, 4140 chrome moly steel, button rifled,1:10 twist with a matte black finish.
Aprox 8.5" long & chambered for more reliable feeding.
These are known as FBI or Secret Service Barrels used in the 80s. They required shorter barrels so they would fit in their Samsonite cases.
This barrel will not work in a semi-auto.