Ultimate Arms Gear Glock 9mm .40 S&W Gen 1 and G26 G27 Sub Compact Pistol Handgun Trigger Guard Mount Weaver Picatinny Rail Adapter for Scope, Sights, Lasers, Lights & Accessories Constructed from Precision Machined Aircraft Grade Aluminum Alloy. The Mount Clamps Securely onto the Trigger Guard. Specifications: Length: 3.3" Inches. Weight: 1.4 oz. Easy to Install , No Gunsmitthing Required. Set Screws Lock Tight to Existing Trigger Guard. Designed to Fit the Glock 9mm .40 S&W Generation 1 and G26 G27 Sub Compact Models and Some Similar Models.