TANDEMKROSS Shock Block Bolt Buffer Ruger PC Carbine. The TANDEMKROSS ''Shock Block'' Bolt Buffer is a great upgrade and is an inexpensive addition to your Ruger PC Carbine Features a high-durometer elastomer insert which Increases durability and reliability of firearm by more-gradually absorbing impact force of reciprocating bolt assembly; eliminating the metal-to-metal contact between the bolt and the receiver pin and eliminates vibration cause by the metal-to-metal contact. The TANDEMKROSS ''Shock Block'' Bolt Buffer reduces impact stress on the receiver made for high tolerances high impact resistance superior load bearing properties. Compatible with both the Ruger PC Carbineand Ruger PC Charger Specifications for TANDEMKROSS Shock Block Bolt Buffer for Ruger PC Carbine: Manufacturer: TANDEMKROSS Color: Black Fabric/Material: Aluminum Features of TANDEMKROSS Shock Block Bolt Buffer for Ruger PC Carbine Eliminates ''Bolt-Battering'' of the receiver Aluminum reinforced buffer body Easy drop in ready no tools required Package Contents: TANDEMKROSS Shock Block Bolt Buffer for Ruger PC Carbine TANDEMKROSS TK28N0407BLK1: Shock Block Bolt Buffer Ruger PC Carbine