The JP Enterprises Adjustable Clamp On Gas Block features minimized small bore design intended to mount underneath many hand guard models on the market. Its two-piece design allows for easier installations even on barrels with pin-and-weld muzzle treatments. This model features our new click-adjustable detent system for precise adjustments and secure retention of your gas screw. Never lose you gas setting or screw.Notes:Attachment 6-32 x 3/8" socket head screws, T15 Torx drive (included). Includes 5/64 x 5/16 roll pin for gas tube installation. Adjustment 8-32, 5/64 hex drive (included) FeaturesClick-adjustable detent system for repeatable setup and secure retention of gas settingSix clicks per rotation of gas screw for finer adjustmentsSplit yoke design for easy installation even on pin-and-weld barrelsEasy to access side gas adjustmentInternally retained detent components means no lost parts