Hard to Find!
FIVE (5) Kits!  Each in polybag.  Mini sets of replacement parts for most Spyder .50 caliber mechanical markers. Factory spec consumer replaceable o-rings, seals, screws, ball detents, bolt, valve, bumper and more! Fits the Advancer, Opus, Stormer and other compatible markers. Maintain your marker by changing the seals & o-rings regularly!

NOTE: this is for a .50 caliber Spyder Paintball marker. It will NOT fit other Spyder markers! Not all parts will fit into every .50 caliber model!