ISMI Sear Spring for Sig Sauer P320 OEM Weight

Designed to fit Sig Sauer Models: P320.

Upgrade your Sig P320's fire control unit with racing-grade reliability using the ISMI Sear Spring in an OEM Weight. Manufactured from certified aerospace-grade chrome silicon, this premium spring delivers superior performance and service life compared to standard music wire springs, lasting up to 10x longer under repeated stress. Engineered using the same technology trusted in IndyCar and Formula One valve systems, each spring is heat-treated, shot-peened, and stress-relieved after winding to ensure maximum durability and precision during cycling. The result: tighter tolerances, consistent sear tension, and enhanced long-term reliability for your P320’s trigger system. Whether you're replacing a fatigued OEM spring or fine-tuning your pistol with high-performance components, ISMI delivers a drop-in upgrade that meets the demands of serious shooters. Race-proven spring tech, now in your P320; available at NDZ Performance.

Features:

• High-performance ISMI sear spring for Sig Sauer P320.
• OEM weight for factory-consistent trigger reset and tension.
• Made from certified chrome silicon aerospace alloy.
• Heat-treated, shot-peened, and stress-relieved for durability.
• Outlasts standard springs, ideal for high-round-count pistols.
• Maintains precise tolerances through compression and cycling.
• Drop-in fit, no modification required.

See our complete line of Sig P320 Products here

Disclaimer: "Sig Sauer" is a federally registered trademark of SIG Sauer, Inc. or SIG Sauer GmbH & Co.KG. NDZ Performance has NO affiliation in any manner with, or otherwise endorsed by, SIG Sauer, Inc. or SIG Sauer GmbH & Co.KG. The use of the word "Sig Sauer " on this page is merely to identify which firearm these parts or components are compatible with.

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.