spring upgrade situation

[Savage]

Got my m4 gearbox all strewn about my table doing a bushing and spring upgrade.

By visual inspection the OEM spring seems to be connected to the inside of the plastic piston (?) by a metal retaining plate.

Can the spring be removed without ruining the piston (?) or do persons normally replace the piston (?) along with the spring?

[Knief]

www.airsoftplayers.com/mechbox/tutorial.asp

about 2/3 down the page.

Start with

Once the bushings are out, put the mechbox aside, and lets turn our attention back to the spring and piston. The piston head is screwed onto the piston, and catches a metal spacer inside the piston that holds down the spring. The problem is that the piston head is covered in plastic, and the screw is inside of it. I recommend NOT trying to simply grab the piston head and unscrew it out of the metal- you don't want to risk ruining the round shape of the piston head. Instead, take a very sharp cutting tool, and start carving out the center of the piston. This is shown in the first picture below.

but you might want to read the whole thing to make sure you've got it all.

[Savage]

Thanks a lot Knief. Appreciate it.