ISMI Magazine Spring for Sig Sauer P365XL P365 X-Macro 17 Round

Upgrade a weak link in your P365's magazine with the ISMI magazine spring from NDZ Performance. This 17-round replacement spring for the Sig Sauer P365XL and P365 X-Macro swaps the OEM music-wire spring for a precision chrome-silicon unit engineered for consistent feeding, longer life, and reliable function under heavy use. ISMI uses motorsport-grade spring technology and manufacturing controls (material selection, coil geometry, heat treating, shot peening) to deliver a spring that holds force and geometry through far more cycles than stock alternatives. Upgrade your Sig with the best upgrades and accessories from NDZ Performance.

Features:

• More consistent feeding: Higher tensile strength and stable tolerances keep rounds presented squarely for reliable follow-ups.
• Longer service life: Chrome-silicon metallurgy vastly outlasts music-wire springs; fewer replacements, less downtime.
• Ready out of the box: Heat-treated, shot-peened, and stress-relieved for minimal initial relaxation and predictable compression behavior.
• Drop-in replacement for P365XL / P365 X-Macro 17-round magazines.

See our complete line of Sig P365 XL Products here

See our complete line of Sig Sauer X Macro Products here

NDZ Performance is ISMI's exclusive vendor for P365 Magazine Springs!

INSTALLATION WARNING: Magazine Floor Base Plates & Extension Devices are secured by Spring Tension & can cause serious injury if improperly handled. NDZ Performance recommends the use of Safety Glasses when removing or installing this product.

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.

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.