Directions to M4 spring
 

Hey ya'll. I'm looking for a page (I'm sure already exhists) that shows step by step instructions on how to change the spring on my TM M4A1

check mechbox.com
look for the vid for the mechbox that the M4 uses, i think its a ver2...
they will give you great vids on disassembly/re-assembly of your gun/mechbox

On mechbox.com, there's the complete disassembly of a TM M733 (essentially, the same process as an M4) including the opening and upgrading of the mechbox, and reassembly of the whole gun.

And be sure that if you upgrade your spring that you also get some metal bushings. Nylon won't hold up to well with stiffer springs.