Bob Hahin AR-15 BOB SLED 223/5.56 1RD DERLIN BLACK LONG OBS20

Self-lubricating, Delrin® loading block replaces the magazine and follower for smooth, single round loading. Bolt holds open after every shot. CNC-machined loading tray ensures proper cartridge alignment and reliable feeding. OBS10 provides a short, match-length loading block. OBS20 is the same size and shape as a 20-round AR-15 magazine; approved for Service Rifle competitions.