Luth-AR is excited to release their new Luth-AR Gunsmith Kit especially designed for gun shop counters, gunsmith shops, and at home AR enthusiasts. The kit includes the following common small parts that are needed when building and repairing your AR style rifles. LR-01 Buffer Retainer- 10 units BL-06-CW .223/5.56 Crush Washer- 5 units LR-02 Buffer Retainer Spring- 10 units UR-02 Ejection Hinge Pin Snap Ring- 10 units LR-09 Bolt Catch Spring- 5 units UR-03 Ejection Port Cover Pin- 5 units LR-10 Bolt Catch Buffer- 5 units UR-05 Ejection Port Cover Spring- 5 units LR-12 Bolt Catch Roll Pin- 5 units UR-16 Roll Pin Charging Handle- Mfg: Luth-Ar