Diana/RWS/Umerex AirKing 350 Full Power Spring

​Direct replacement Spring fitting OEM guides for DIANA-RWS 

Spring measurements:.820 ODx.128" Valve Vanadium wire replacement spring
Closed, ground and polished ends 
820 x 128 - 40 coils
20.8mm x 3.2mm

EZ cocking delivering excellent power.
Diana 350
BAM28
Umerex AirKing