Swenson barrels for Glock are precision machined from 4150 chrome moly vanadium steel and finished with melonite for wear and corrosion resistance. These barrels are designed for improved accuracy, while still allowing for a drop-in fit. Reloading for your Glock has never been easier thanks to the standard rifling (for compatibility with all bullets, including cast), and a fully-supported chamber. The 1/2" - 28 threads also allow the use of a suppressor. Part may require fitting to your specific gun. Features1 in 16" Twist4.56" BarrelMelonite Finish 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.