Apex Tactical Specialties Polymer Armorer Block. 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). Specifications for Apex Tactical Specialties Polymer Armorer Block: Manufacturer: Apex Tactical Specialties Gun Model: Smith & Wesson M&P Condition: New Package Contents: Apex Tactical Specialties Polymer Armorer Block What firearm models does the manufacturer say Apex Tactical Specialties Polymer Armorer Block is compatible with? The manufacturer says that Apex Tactical Specialties Polymer Armorer Block is compatible with Smith & Wesson M&PApex Tactical Specialties 104-001: Polymer Armorer Block