How to change nuprol m4 spring

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i recently got a nuprol enforcer alpha and i have taken the stock off to see if they quick change spring is there and i have tried to take the gear box out to try and get to the spring from there but the gear box woudnt come out

 

[L3wisD]

This video should help.

Whilst it covers the spring change in a Specna Arms, I'm quite sure it'll be a similar method on your Nuprol.

The video is a bit dark, but easy to follow.

If it's your first time doing it, take it slow and slow yourself plenty of time.

Keep some tubs or cups on the table and keep the bolts and pins in them in a logical progression as you go.

You can do it fella! (Shouldn't take you longer than 30-40 minutes for your first time)

 

[Cutrimson]

According to the blurb on the Nuprol Delta series, the V2 gearbox fitted to all models comes with a quick change Spring so I would assume you just need to take the rear stock off and unscrew the nut/screw that holds the spring in place?

NUPROL - DELTA Enforcer Alpha AEG Carbine - same internal componants as its higher end counterparts like the freedom fighter and the AK21 these are the reinforced V2 gearbox, quick change spring, full steel tooth piston, micro switch trigger high torque flat motor and even a 6.03 tight bore barrel.