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Established 2006. Kent's Only Authorised 5.11 Tactical Retailer

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Step up your FPS

The Element M115 spring is one of the simplest ways to increase the power of an airsoft AEG. Rated around 340 to 380 FPS depending on your gearbox, cylinder and barrel, it is a popular first step for anyone building a DMR-style or higher-FPS platform.

Smart irregular pitch design

Unlike a plain linear spring, this Element spring uses an irregular (non-linear) pitch. That makes it easier to compress during installation and reduces stress on the piston as the sector gear picks it up, helping your gearbox last longer.

Built to last

Wound from oil-tempered steel wire, the M115 delivers consistent output shot after shot and fits most Version 2 and Version 3 metal gearboxes. Pair it with quality internals from our airsoft accessories range for the best results.

Let our techs fit it

Spring swaps mean opening the gearbox, so we recommend fitting by an experienced or qualified technician. Incorrect installation can cause damage not covered by warranty. Our Tech-It! service in Kent can fit, test and chronograph it for you. Always check your site’s FPS limits before upgrading.

General
BrandElement
Other
TypeAEG upgrade spring
RatingM115
CompatibilityMost Version 2 and Version 3 metal gearbox AEGs
Output guideApprox 340 to 380 FPS (gearbox dependent)
Velocity basisAround 115 m/s nominal
PitchIrregular (non-linear) pitch
WireOil-tempered steel
Best forDMR-style and higher-FPS builds
FittingRecommended for experienced or qualified technicians

Frequently asked questions

What FPS will the M115 give me?

Roughly 340 to 380 FPS, though the exact figure depends on your gearbox, cylinder, air seal and inner barrel length.

Will it fit my AEG?

It fits most Version 2 and Version 3 metal gearbox AEGs. Check your gearbox type if you are unsure.

Why an irregular pitch spring?

The non-linear pitch is easier to compress on install and reduces stress on the piston, which can help extend gearbox life.

Can I fit it myself?

Only if you are experienced with gearbox work. Incorrect fitting can cause damage not covered by warranty, so we recommend our Tech-It! service.

Will this pass my site's FPS limit?

M115 is aimed at DMR and higher-FPS builds, so always chronograph the finished build and confirm it is within your site's limits before use.