ISMI Recoil Spring for Smith & Wesson SD9 & SD40 VE 18lb

Upgrade your Smith & Wesson SD9 or SD40 VE pistol with an ISMI 18 lb. Recoil Spring; engineered for serious shooters who demand long-lasting, consistent, performance. Manufactured from certified chrome silicon aerospace-grade alloy, this spring is heat treated, shot-peened, and stress-relieved after winding to deliver superior reliability over traditional music wire springs. Designed with the same advanced engineering principles used in IndyCar and Formula One racing, ISMI springs are built to endure extreme cycling conditions with tight tolerances and minimal fatigue. Whether you're replacing a worn spring or fine-tuning your setup, the 18 lb. option offers a balanced blend of recoil control and slide timing. Get race-proven spring technology for your Smith & Wesson SD pistol only from ISMI and NDZ Performance.

Features:

• Fits Smith & Wesson SD9 & SD40 VE pistols.
• 18 lb. spring rate, ideal for recoil control and tuning.
• Made from certified chrome silicon aerospace alloy.
• Heat treated, shot-peened, and stress-relieved for maximum durability. Precision-wound for consistent compression and cycling.
• ISMI chrome silicon springs outlast standard music wire springs by up to 10x, and are built using racing-grade spring engineering.
• Made in the USA

Note: Not compatible with Glock Guide Rods, using these springs with a Glock guide rod in your SD9 or SD40 will result in damage to your firearm. 

See our complete line of Springfield SD9 & SD40 Products here

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.