TacFire Ruger 10/22 1022 10 22 Rifle Black Aluminum Scope Base Mount Adapter Dual Weaver/Picatinny & Dovetail 6 Slot Ruger 10/22 Weaver Style & 3/8 Dovetail rail Mounts onto the top of the 10/22 receiver utilizing the pre-drilled holes on the receiver Provides two types of rails (Weaver & 3/8" Dovertail) for mounting a scope or Reflex Optic T6 6061 Aluminum . Includes 4 Set Screws and Allen Wrench (no rifle modifications necessary) Color: Black / Length: 4.7" / Weight: 1.1 oz