RIFLE: REMINGTON ARMS COMPANY MODEL 510 TARGETMASTER, SERIAL NUMBER NONE, BLACK (MATTE), CASE NOT INCLUDED, 24, 22 LONG RIFLE (22LR), BOLT Notes: REMINGTON 510 TARGETMASTER - .22 LR - Manufacturer: Remington - Model: 510 TargetMaster - Caliber: .22 LR - Action: Bolt Action - Capacity: Single Shot - Barrel Length: 24" - Barrel: Routledge Bore Barrel The Remington 510 TargetMaster is a classic rimfire rifle with a traditional bolt-action design and a 24" barrel. Its single-shot configuration gives it vintage appeal, making it an interesting find for collectors and enthusiasts who appreciate classic Remington rimfire rifles.