Brass Stacker MNCKSPRB Cocking Knob Safety Pull Ring for Mosin Nagant Rifles, Black Enhance your firearm safety Large diameter finger hole will accommodate even gloved hands and does not interfere with bolt function Easy installation utilizing a simple non-marring soft brass set screw with no permanent modification to the firearm required Sleek stylish look and superior American craftsmanship in black oxide finished steel Access to slotted end of the firing pin via clearance hole through set screw