ERGO Grip Armorers Block Large Frame Glocks w/Base Black. Simply bolt clamp or slide the MAST modules into the MAST Base to securely attach it to a bench. Then slide your firearm onto the module to lock it in place. Specifications for ERGO MAST System Modular Armorer Stand: Manufacturer: ERGO Quantity: 1 Fabric/Material: Reinforced Polymer Gun Type: Pistol Features of Ergo Grip System - Modular Armorer Stand: MAST Mounting. MAST design allows each module to be mounted in a vise screwed to a work bench or secured in the base. Built Strong. Built to Last. Made from reinforced polymer that is super tough and impact/temperature/chemical resistant. Stainless Steel Base Pins. The MAST base comes with two stainless steel pins for securing each module. MAST Base Mounting. MAST base has four mounting holes & allows the base to be screwed to any flat surface. Magazine Lock. MAST modules lock securely into the firearm's existing ambi-magazine release. Modular. MAST modules will be available soon to fit additional firearms. Package Contents: ERGO MAST System Modular Armorer Stand What firearm models does the manufacturer say ERGO MAST System Modular Armorer Stand is compatible with? The manufacturer suggests that ERGO MAST System Modular Armorer Stand is compatible with Universal Colt 1911 Glock 24 Glock 17L Glock 32 9mm Glock 33 .357 Glock 31 9mm Glock 22 9mm Glock 17 9mm Glock 27 .40 S&W Glock 23 9mm Glock 22 .40 S&W Glock 19 9mm Glock 23 .40 S&W Glock 26 9mm Glock 21 .45 ACP Glock 29 10mm Glock 40 10mm Glock 30 .45 ACP Glock 41 .45 ACPERGO Grips 5004: Armorers Block Large Frame Glocks w/Base Black