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.
Brand: ISMI
Type: Magazine Spring
Model: Plus 5% 12 Round Magazine Spring
Country/Region Of Manufacture: Made In USA
UPC: Does Not Apply
NDZ Custom Kit: No
Material: Chrome Silicon
Texture: Smooth
For Gun Make: Sig Sauer
For Gun Model: P365
Caliber: 9mm, .40 Caliber
| Gun Make | Sig Sauer |
|---|---|
| Product Type | Magazine Spring |
| Product Model | Plus 5% Power |
| Product Material | Chrome Silicon |
| Gun Model | P365 |
| Capacity | 12 Rounds |
11 Reviews Hide Reviews Show Reviews
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Sig magazine springs
The magazine springs arrived promptly and were as advertised. No issues at all. I installed one to check and it performs perfectly. Thanks!
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A great place to shop.
Spare springs are good to have around and the shipping was super fast.
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Nice and tight
Springs work flawlessly
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Great springs
These allowed me to hand load all 12 rds. with metal followers from Lakeline ĺlc, where original ones needed an Uplula to force in last rd.
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Great springs
These allowed me to hand load all 12 rds. with metal followers from Lakeline ĺlc, where original ones needed an Uplula to force in last rd.
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Outstanding fit & functionality!
Had a really bad round (new brass too) that blew out the bottom mag plate on Sig P365XL and spring got lost. This fit perfectly as a replacement spring.
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Not all that great.
The springs would not fit tight to the base plate retainer. I figured I'd try installing them anyway. Loaded them up and the rounds rattled like crazy. I tried tapping the base, no help. Still rattled. These did not work for me. YMMV.
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Excellent replacements
So I guess I was the lucky winner to get a all 3 mag springs that were straight trash from my P365 Tacpac. Once I got these springs swapped in from the factory set, everything went absolutely smoothly. Feeding ammo into the magazines felt easier and NO MORE SNAGS! The factory springs kept getting hung up in the magazines.
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5 stars
