Product Description The ZEV Technologies ISMI Recoil Spring is a flat-coil, factory-style recoil rod spring designed to help tune recoil characteristics in compatible Glock pistols. Rated at 17 lbs, it is commonly used with 9mm, .40 S&W, and .357 SIG Glock models and is intended for effective recoil management when running standard ammunition, including 124gr-145gr 9mm loads and extra-power ammunition. Product Highlights 17 lb recoil spring designed for recoil management and reliable cycling Flat-coil, factory-style recoil rod spring design Commonly used in 9mm, .40 S&W, and .357 SIG Glock models Works well with standard ammunition and extra-power loads (including 124gr-145gr 9mm) Great option for recoil reduction in .40 caliber and .357 SIG setups Specs Brand: ZEV Technologies Product Type: Recoil Spring Spring Weight: 17 lb Design: Flat coil, factory-style recoil rod spring Compatible Calibers/Models: Commonly used in 9mm, .40 S&W, and .357 SIG Glock models UPC: 646809492228 Manufacturer Part Number: ZEVISMISPRREC17L Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.