The Battle Arms Development One:1 Fluted Barrel for GLOCK 19 is named after their revolutionary machining process that utilizes a single machine to machine every component of the barrel from start to finish to ensure the highest level of consistency and precision possible. Including single point cut rifling which eliminates any stresses on the bore for perfect concentricity, uniform twist rate, and ultra-precise groves with a standard deviation of less than .0001 of an inch. This aftermarket Glock 19 barrel is machined from 4140 steel and features a durable black Nitride finish.Features: For Glock 19 Gen 3-5 Ultra-precise machining process 4140 steel Black Nitride finish Straight fluting 1:10 Twist rate 11deg Target crown 9mm +P Rated Made in USA 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.