ISMI Premium Springs are manufactured exclusively with certified aerospace specification alloys such as chrome silicon. Their springs are heat treated, shot-peened, and stress relieved after winding to enhance performance and durability. Chrome silicon springs have 10x the life of traditional music wire springs, and they hold much better tolerances during compression and cycling. This spring features improved materials over the stock components and also maintains the stock trigger weight of 16 lbs. Get an ISMI recoil spring to improve your firearm’s quality and trigger feel today!

• Only fits 1911 Models with a 5″ Barrel and SIG P320 Models with a 4.7″ Barrel
• Maintain the stock trigger weight of your firearm with this 16 lb recoil spring
• ISMI springs are made in the USA from durable Chrome Silicon

Note: NDZ always recommends any part be installed by a qualified and trained gunsmith. NDZ promotes the use of safety practices and gear when working on any firearm.