The Ultimate Upgrade for Gen 3 & 4 Glock 17 Pistols. Precision Machined from Certified Pre-Hardened 416R Premium Grade Stainless Steel Stress Relieved After Rifling for Hardness of 38-42 Rockwell C Prior to Machining Completion Double Honed to Produce the Smoothest Bore Possible with a Max RA of 12 SAAMI Match Grade specification chambers precision cut and finished to a maximum RA of 16 6 Groove Cut Rifled to create consistent 1:10 Twist Enhanced Slide Fit & Lock Up for Improved Accuracy Straight Fluted for Aesthetics QC Inspected Drop-In - Gunsmith not Required Rated for +P Ammo Use Bead Blasted to Create a Satin Finish Prior to Plating