The SRS Bakelite ball bolt knob is a first party accessory for the SRS rifle.  The ball knob is an easy install knob that makes operating the action of the rifle easy. 

Compatibility: 

• Silverback Desert Tech SRS A1 Sniper Rifle 
• Silverback Desert Tech SRS A2 Sniper Rifle 

Includes: 

• x1 Silverback SRS A1 / A2 Bakelite Ball Bolt Knob