Opening up a mechbox a gun and finiding all the screws are different
Finding a grand total of three shims inside a mechbox.
Working on the M3 shotgun
YANHCHAN'S AIRSMITHING: AEG repair/Tune up/Upgrades V2/V3 mechboxes, rewiring/reconnecting.
Ask not what your country can do for you; ask what you can do for your country ~John F. Kennedy