Tacfire Buffer Retainer Pin and Spring Features The Tacfire Buffer Retainer Pin and Spring is designed as a direct replacement part for the buffer retainer assembly on AR-15 pattern rifles. The spring is made from the same type of material used in piano wire which gives it the resilience to hold tension reliably over repeated cycling. That same material composition is what reduces the audible twang often heard when firing an AR platform resulting in a quieter shooting experience. This part is purpose built for 5.56 and .223 Remington caliber rifles matching the buffer tube hardware found on the vast majority of AR-15 builds. Shipping as a 10 pack this set gives armorers gunsmiths and home builders a supply of pins and springs on hand for ongoing maintenance or multiple rifle builds. Having spares ready reduces downtime when a retainer pin or spring wears out or gets lost during disassembly. The finished black color matches factory AR-15 hardware for a clean consistent appearance inside the lower receiver. This buffer retainer pin and spring set is a practical affordable addition to any AR-15 owner s spare parts kit. TacFire Buffer Retainer Pin and Spring Specifications Manufacturer: TacFire Color: Black Type: Buffer and Buffer Parts Fit: AR-15 Quantity: 10-Count Available At: GrabAGun