The Gunner's Mount is the ideal platform to work AR/M4 lowers. Assemble, disassemble, and repair. Parts pockets are cut to prevent runaway components and a slot for supporting magazines when making repairs. The platform will also accommodate pistol magazine posts and other magazine fed weapon systems. View a PDF of the Gunners Mount Strategically cut for: Magazine re-work AR charging handle for latch change outs BrownellsA(R) AR Front Sight Bench Block Present Arms AR Upper and Lower Receiver Blocks Present Arms AR Receiver Tube Alignment Block Present Arms Pistol Magazine Posts Mfg: Present Arms Inc