[MaciekA]

Hi guys,

I'm tinkering with my PDW this week and have been looking to swap the M140 that came included in the gun; ~425fps or so is obviously way too hot for this gearbox / gaming, and I'm also looking for less gearbox stress and a higher RoF.

I tossed in the included stock spring, and this brought it down to a hair under 400fps. This is still too hot for me, and besides, I'm looking to increase RoF which is lacking in the stock DBoys PDW.

A few weeks ago I picked up a JG 3 spring set labelled M110, M120, M130. I tried the M110 in my JG G36 and got very low velocity through the chrono, about 270fps. To double-check if I had compression problems, I popped in the stock spring back in and the G36 went back to around the mid-350s, i.e. back to normal. I gave up and stuck with the G36's stock spring (which I had wanted to ditch because it was attached to the piston with a hook, and I wanted to try a different piston).

So this week, I tried the same JG M110 spring in my PDW to try to lower it down from 400fps. Lo and behold, I get a very low speed, below 200fps. This is a confusing result for me, since the same gun is easily getting almost all the power out of the M120 spring and passes simple compression checks, so I figure I'm missing some knowledge.

I noticed both the PDW's stock (M120) and import (M140) springs are short length springs. The G36 also came with a shorter length spring (presumably ~M110). The JG M110 that is giving me unhappy results is a longer spring spring though, which is making me wonder if I'm just picking the wrong lengths.

Am I supposed to seek out a shorter replacement spring for my PDW? Or is a spring is a spring is a spring? I'm a bit confused.

Thanks