Apex Tactical Specialties Armorer's block, For Gunsmiths, Polymer, Red 104-001 The Apex Armorer's Block is designed for gunsmiths" law enforcement and military armorers and do-it-yourself home gunsmiths to work on Smith & Wesson M&P and Glock model pistols. Works in conjunction with the Apex Armorer's Tray" Apex Shield Trigger Assembly Block and Apex Fat-Faced Trigger Assembly Block (each item sold separately).