No luck ! M4

[No_Way]

Humm the last month i have put a M203 Long on my TM M4 with a Metal Body. What a pain !

Last day, i tried to shoot some mag to keep her fresh. After a mid-cap all things goes wrong and the gun have just stopped to work. At first a motor who try to turn gear and after that nothing.

I have take the gun apart with no graphic...yahoo to me. I have found some tape. Under the tape (connecter to gearbox) it was a shitty fuse connector with no fuse. I have cut this cable suspecting the problem. After 4 hour of trying replacing all thing together, i have fixed a new cable with a new connector. The gun was tested and just worked fine minus some problem.

#1 : The gear on the motor is a little stripped (still work)

#2 : The gearbox look like cracked

#3 : The metal body have a crack...

#4 : On full auto it work fine, on the semi it shoot 1-2-3-4 bb's at random in one shot.

My setup is a base tm gearbox with some upgrade to put it just below 350fps (guess the spring). I use a 9.6v battery with mid-cap King arms mag. Of course, the hop-up just goes off itself while firing.

The first 3 problems i just know it's a matter of time before anything will break in it. I just try to understand the #4. I lubbed the hop-up just in case. Maybe it's the battery, maybe it's the hop-up, maybe it's the mags...

If you already got this problem and can write some work in relation with, i thank you now !

[bobotea]

Ok I had the same problem #4 on my JG m4. I thought it was the cut off lever so I replaced it with a systema one but that didn’t fix it at all I also replaced shims and bushings. So now I am just going to replace the whole gear box with a modify tune up kit because it really pissed me off (and I cant shim for @&%#). Now back to the problem. It can range from a bad shim job, to worn cutoff lever, to a bad selector plate, a messed wire set, a worn sector gear... and much more. I would take it to your local gun dock to make sure, but if you see any unusual warn parts then I suspect those are the ones that cause the problem.

[No_Way]

The way i think you see number #4 it you pull the trigger for a single shot (selector on semi) and the gearbox cycle the number of time 1-2-3-4 with a bb on each shots.

On my side it's you put the gun on semi, you pull the trigger the piston just go back and forth one time and tadam shotgun effect 4 bb's, sometime one...totally random

[bobotea]

Originally Posted by No_Way

On my side it's you put the gun on semi, you pull the trigger the piston just go back and forth one time and tadam shotgun effect 4 bb's, sometime one...totally random

oooo... that is really weird i would presume its you’re mag. Does the little dimple that keeps the BB's in the mag look worn or small?

[lupo]

If your gearbox is broken that will lead to all kinds of feed issues. I would suggest taking it to a gun doctor in your area before you fire the gun again. If your gearbox is broken and the gun still fires it will only be a matter of time before your hopup breaks. Gears or pistons can strip once the box is broken aswell.

[Kos-Mos]

AND your metal body is cracked.

This probably causes some alignment problems with the hop-up, and can be the cause of shotgun fire.

[No_Way]

New gun.....yéééé !!

Or i change gearbox,hop-up set, metal body...around 400$ shipped. Price of a new gun. Damnation why all thing can go right at the same time...always something bad to take care to not be totally happy with the good thing when they happen !