Solink M100 Stainless Steel AEG Spring

The M100 rating puts you roughly in the 320–380 FPS range on 0.20g BBs, which is the sweet spot for general outdoor field play. That clears most 380 FPS caps and sits inside the 400 limit some fields run. It's a step up from the M90 that ships in most entry-level builds — enough extra punch to feel the difference, not so heavy that you need a rebuilt gearbox to pull it.

Fits your gearbox. The spec lists compatibility with all version AEG gearboxes. In practice, that means standard V2 and V3 shells — which covers the vast majority of AEGs players actually own. V6 and V7 platforms use different spring sizes, so double-check yours before buying.

Swapping is easy on V3, a project on V2. Most Version 3 gearboxes have a quick-change spring guide at the rear, so you slide the old spring out and the new one in through the back of the box — no disassembly. Version 2 gearboxes don't work that way. Swapping the spring means splitting the shell, reassembling, and getting your shimming right. Budget an evening for a first V2 swap and grab a proper spring pliers.

Match the rest of your setup. A heavier spring raises stress everywhere downstream. Piston, gears, motor current, battery draw — they all go up together. If your gearbox internals are still stock entry-level, that's the limit you're pushing. Pair it with a high-torque motor, solid bushings, and clean shimming, and it'll pull reliably. Skip that and you're asking for burnt trigger contacts and stripped teeth.

The M-rating is a guide, not a chrono result. The same M100 spring in two different setups gives two different numbers. Your cylinder type, barrel length, air seal quality, and even spring tolerance shift the velocity. That's why field limits are enforced on measured FPS, not on what the spring is called. Chrono with your own BBs before your first game — don't trust the M-rating or the factory number.

What it's not for. If you need indoor CQB power in the 300 FPS range, an M80 or M85 is the better pick. This one leans outdoor and general skirmish.