For international shipping please email us your address and how many springs you would like. We will then send you an invoice with updated shipping charges and grand total. Shipping method used is USPS. Grab some of these springs today and upgrade all of your T4E pistol magazines to their maximum potential! These springs work best with heavier kinetic rounds to inflict maximum collateral damage! *note we do not recommend using paintballs after doing this mod ��Revised version 2 spring�� When customers speak we listen! Apparently there were one or two cases where our original spring failed and released all the remaining air from the marker all at once. This is known as “blow-by” and happens when the valve fails to close. Now although it could have been a defective magazine, a defective spring or even an installation error, we do take feedback serious. So we got back to the drawing board! Unfortunately we were not able to replicate this blow-by malfunction but in the process we did find a more efficient spring! After countless hours of testing we found that this new spring still gives us the power increase which we all crave, boosting the marker right up to 7.0 Joules, but another really cool feature that we noticed is that we were able to return more shots per co2! We have tested this mod with all models of T4E pistols and are extremely happy with the results. Maximum power and maximum efficiency with a simple drop in modification. We were able to get 4 full magazines (32 shots) off one CO2 with this mod. No leaks, no blow-by, and it was still hitting hard after 32 shots! If more power is what you want then that’s exactly what you’ll get with this easy drop-in modification! This mod Works for all Umarex T4E .43 caliber pistols including: TPM1 Walther PPQ M2 Walther PDP Smith & Wesson M&P9 2.0 Glock 17 Gen 5 Heckler Koch SFP9 VP9. Power test video click here!   * note: If you have purchased our first version spring and would like to upgrade to this new version please email us with your info and how many springs you need and we will send you an updated invoice with 50% off discount for your loyalty.