Volquartsen Firearms V-Locking Block for 10/22 and 10/22 Magnum Silver. This part is machined from stainless steel and then hardened to Rc 4042. The combination of stainless steel and the heat treating process results in an extremely rigid and durable locking block No more worrying about over tightening the retaining screws and cracking the factory issued V-Block. Specifications for Volquartsen Firearms V-Locking Block for 10/22 and 10/22 Magnum: Manufacturer: Volquartsen Firearms Gun Model: Ruger 10/22 Gun Make: Ruger Gun Type: Rifle Fabric/Material: Stainless Steel Color: Silver Condition: New Country of Origin: USA Package Contents: Volquartsen Firearms V-Locking Block for 10/22 and 10/22 Magnum What firearm models does the manufacturer say Volquartsen Firearms V-Locking Block for 10/22 and 10/22 Magnum is compatible with? The manufacturer suggests that Volquartsen Firearms V-Locking Block for 10/22 and 10/22 Magnum is compatible with Ruger 10/22Volquartsen Firearms VC10LB: V-Locking Block for 10/22 and 10/22 Magnum Silver