Single loading a magazine fed rifle can be difficult, if not downright impossible. The Bob Sled fixes this problem by locking into the gun like a standard magazine, and providing a shallow trough onto which a cartridge can be placed and held in perfect alignment with the chamber for smooth loading. Constructed of Delrin for durability, the Bob Sled is sized to match the profile of a regular magazine. This is an NRA Service Rifle legal loading block for the DPMS LR-308 and KAC SR-25. Specifications: Material: Delrin Color: Black