ISMI Premium Extra Power Firing Pin Spring prevents the firing pin from striking the primer when the slide is closed. The heavier spring keeps the firing pin stop from dropping out during firing. All ISMI Springs are made from silicone chrome instead of 150 year old music wire. Every ISMI spring is heat treated, shot peened & stress relieved to enhance durability, consistency and reliability. ISMI is a contractor of the U.S. government and produces springs used in machine guns with incredibly high cycling rates. Also, the creator of ISMI springs obtained his knowledge from extensive research in the development of springs used in Indy car racing.
In independent testing, ISMI spring have endured in excess of 100,000 compression cycles. We don’t recommend going that long between changes however. With an ISMI spring, practice routine maintenance and change it once a year.
Warning: This product may be alloyed with trace amounts of lead and other elements which are known to the State of California to cause reproductive harm and cancer. To prevent exposure, do not alter the product by welding, grinding, etc. For more information, go to www.P65Warnings.ca.gov.
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THE FINEST 1911 SPRINGS YOU CAN PURCHASE !!!!INSTALL IN YOUR 1911 PISTOL & WILL NEVER HAVE TO BE REPLACED, IN 3 LIFETIMES !!!! DOES NOT GET ANY BETTER THAN "CHR-SILICON" FOR ANY TYPE OF COIL SPRING. SIMPLY REMOVE FROM SLIDE, CLEAN, LUBE, & REINSTALL IN THE SLIDE. NOT ONLY DOES THIS SPRING PREVENT "FORWARD F/P SURGE" & POSSIBLY IGNITING THE PRIMER, IF THE PISTOL FALLS ON THE MUZZLE & A LIVE-ROUND IS IN THE CHAMBER. AFTER IGNITING A CARTRIDGE PRIMER, IT ALSO RETRACTS THE F/P QUICKER & PREVENTS WHAT IS KNOWN AS "POST-IGNITION F/P TIP DRAG". JUST GET ONE, LUBE, INSTALL, & SHOOT VIRTUALLY FOREVER !!!!!!