D-Boys Bolt Assembly For D-Boys DOUBLE BELL Kar-98 98K Bolt Action Sniper Rifles Airsoft (Spring Version)D Boys Bolt Assembly For D Boys DOUBLE BELL Kar 98K 98K Bolt Action Sniper Rifles Airsoft (Spring Version) Metal construction. Complete replacement bolt assembly for the DOUBLE BELL D BOYS WWII Kar 98K 98K bolt ACTION carbine. The bolt assembly replaces damaged broken bolt assemblies and is a simple, drop in product that requires no modification to the current gun. As always, upgrading sniper rifle require necessary skill & technique to dissemble the