ISMI Sig Sauer P365 12 Round Magazine Spring Plus 5%

Upgrade feed reliability in your Sig P365 with a precision-wound +5% power ISMI magazine spring made for 12-round magazines from NDZ Performance. Built from durable chrome-silicon and finished with motorsport-level processes; this spring delivers more consistent upward force, longer life, and predictable compression compared to stock music-wire springs. Find the best components to upgrade or repair your Sig pistol at NDZ Performance.

Features:

• Corrects weak-feed symptoms when using extensions, heavier followers, or worn magazines.
• Tuned lift (+5%): Extra force without excessive muzzle dip when installed correctly.
• Longevity & stability: Chrome-silicon alloy resists relaxation and holds tolerances far longer than music-wire springs.
• A spring that’s too light causes misfeeds; one that’s too heavy can increase muzzle dip or affect timing. If unsure, consult a qualified armorer.

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

See our complete line of Sig P365 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.