BSF 300 Blackout 10.5" 5R Rifling 1:8 Twist Pistol Gas Barrels are built out of 416R stainless steel and roll-wrapped in a carbon fiber sleeve for enhanced strength and better cooling. The carbon fiber BSF uses is specially designed to move at the same expansion rate as the 416R stainless steel. BSF also drills holes into the carbon fiber allowing air to move around the barrel and vent heat quicker without any delamination issues. Using these methods keeps the rifling straighter the warmer the barrel gets and allows the barrel to maintain stiffness and strength while keeping the barrel extremely lightweight.

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It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

It is the customer's responsibility to be aware of all applicable laws and regulations regarding the purchase and ownership of uppers with a barrel length of less than 16". Federal NFA regulations are applicable to this item.