9mm Black Nitride email a question
These barrels are finished in house, and are threaded to order. The lengths are cut, but the barrels are not threaded until ordered. Shipment of these barrels may take 3-5 business days. These barrels are made to the spec for 9mm AR 15 conversion uppers, which are fed from a straight feed, double stack, double feed magazine.
These custom barrels are made of 4140 tool steel with a black nitride finish and 1:10 twist. Barrels are threaded at time of order and are concentric within ±0.001.