Airsoft Spring Strengths

After playing airsoft for a while, I found myself with a bunch of springs of different strengths. Of course, I lost the boxes, so it's impossible for me to differentiate them now.

Luckily, those days are over! I designed tags to recognize my springs. M90, M110, M120, they are no longer a mystery to me!

Additionally, I added a piece to my Picatinny rail to remind me which spring I installed in my airsoft gun !

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By the way, do you know the "M" rating of your spring? It's not universal, but it will help you figure it out. Just follow this small conversion table:

Use a chronograph with 0.2g BBs.
Based on your FPS, you can deduce the power of your spring:

M80: 230-250 FPS
M90: 280-300 FPS
M100: 310-330 FPS
M110: 330-350 FPS
M120: 350-380 FPS
M130: 380-410 FPS
M140: 410-430 FPS
M150: 430-450 FPS

Take this with a grain of salt, as it will also depend on your battery level and the quality of your replica. So, perform these tests with a clean barrel and