SELECT PLATFORM BUILD BUILD BUILD HK Receiver Alignment Mandrel (RAM) Part 1: Inserting the RAM into the Receiver Part 2: Receiver Alignment Process Part 3: Bolt Carrier Drop Test HK G3 Barrel Install & Removal Tool HK MP5 Rear Sight Base Alignment & Welding Jig WAWJ-SBR | Weapon Alignment & Welding Jig (Base Setup) WAWJ-SBR | Weapon Alignment & Welding Jig (Welding Mandrel Setup) WAWJ-SBR | Weapon Alignment & Welding Jig (Weapon Support Spindles)