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This is a replacement for the main spring in the STI RecoilMaster guide rod system. This spring does not require replacement like a standard recoil spring. Rather you may want to replace it if your current RecoilMaster spring has been damaged/altered, or if the pistol with this part installed has been shot more than 30 - 50 thousand rounds. Also, these springs cannot be swapped out to alter the felt recoil of the pistol. They are matched to the type of pistol: length of gun and caliber. A 9mm or 38 Super pistol uses a "light" spring, whereas a 40 S&W or 45 ACP pistol uses a "heavy" spring.
Note: STI has discontinued the sale of aftermarket parts. If the specific length/weight is not listed on the drop-down menu it means we are out and won't be getting any more.