Please note that we recommend buying the "ASSAULT-GRADE SPYDER EKO VALVE PIN" in conjunction with this spring, as this spring's force against your stock EKO VALVE PIN, will cause it to bend at the thick-to-thin transition point and accordingly, the PTFE seal will not seat -and seal- properly, resulting in a gas leak. You can bend the pin back straight to "make a plan" temporarily, although, the weakpoint on the joint will still be there.

Please also the comparison picture - the illustration w/ both this spring and the nickel plated one that the SPYDER markers come w/ standard.. This is to visually illustrate the difference / potential compressive force that this spring is more or less capable of.

This is the 'assault grade' spring for the SPYDER brand of paintball markers, and REALLY beefs up the muzzle velocity of the gun, up to about 400 FPS using a 20 OZ CO₂ tank, which is really massive for a paintball marker.
We likewise hold the point that, SPYDER markers as a rule of thumb, have higher power potential compared to your TIPPMANN (and family of) markers. Even the humble SPYDER VICTOR can really be turned into a heavyweight slugger w/ this spring, using your .68 SOLID NYLON BALLS 54GR - 100's - just try otherwise to refrain from using lighterweight / general purpose 34gr rounds, as they will fly all over your sight picture.

Furthermore, if you find your accuracy is still lacking, consider getting a BALLISTIC 48CI 3000PSI HPA PAINTBALL TANK instead, as regulated high pressure air will give you considerably better accuracy compared to CO₂ and also shoots much cleaner, leaving less carbon fouling in your marker.. The problems associated w/ leaking will also be lessened. Refill costs on these tanks are negligible and some retailers offer a free full top-up of these tanks, as the same compressor used to fill up a PCP reservoir or bottle, is used to fill up these tanks.

Please note that to fire our TRIPLE IMPACT SLUGS FOR .68 MAGFED (74GR) - 15's from your SPYDER MR series marker, you will ideally need this spring. If you want to run a regulated 48 CI tank w/ this combination, you'll need to tune the regulator up, otherwise there will not be enough blowback force to automatically recock your gun after each shot fired.

The damage this spring can help your marker accomplish, is a dramatic uptick from the SPYDER's standard capability. For converting your marker into a self-defence or anti-riot weapon, we highly recommend this.

Technical Specifications;