The Matrix Arms Barrel is fully manufactured in house in a New Hampshire facility. As with all Matrix Arms products, these barrels are held to the tightest tolerances where it matters most. Each barrel purchased from Matrix comes with a hand polished feed-ramp for the ultimate reliability. Whether for competition or combat the Matrix Arms Glock barrel gives highly improved accuracy which is only increased dramatically when paired with Matrix Arms wire EDM cut slides and complete MX aluminum frame. Due to manufacturing all major components in house Matrix Arms is able to hold incredible tolerance matchups between parts.DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.