King Arms M4A1 help!!

[j3ttamaster]

i noticed on mine the adj screw hole is smaller in diameter then the one that came off and the motor doesn't seat

applies to much pressure to the motor

[Anthology]

Originally Posted by justynmagz

Turns out it was the screw in the grip. The motor came down and now cycles. The only problem though is that it cycles but doesn't fire. I think that the problem is the sector gear not grabbing the plastic cylinder to bring the spring back. Could be wrong. Will open her up and check and see....any tips on how to make sure it grabs? I've seen this problem before with my rifle.

The motor spins and engages the gears or just the motor spins?

If it's the first choice, then something is definitely strange with your sector gear or piston teeth, possibly the intermediate gears as well.

If you chose option two, then you have likely lowered the motor too far. If you did not hear any catastrophic noise, you likely did not strip the teeth of the gears, which is good. Definitely check the pressure exerted on your motor by the new grip but I would focus my attention on the bevel to pinion interaction/shimming and the demons associated with that.

There are so many areas where power transfer components of a gearbox can face resistance and lock up but at this point (given that this problem started after installing the grip) the most probable source of these problems are motor to grip interaction, which could affect motor operation. Or motor to grip interaction which could have changed the way your pinion gear engages your bevel gear.

Hope this helps! Cheers!

[justynmagz]

So I managed to resolve everything! Thanks to everyone who contributed in this thread!

The problem initially was the motor needed to come down a bit as the new MIAD grip had it way too high. Then what was happening was that it wouldn't fire the nozzle however the spring was cycling. I fixed this quick as I noticed that the tappet plate wasnt connected to the nozzle.

Then I noticed that it still wasn't firing BBs. I opened it up one last time, watched a video on youtube of what a gearbox looks like when it cycles (as I obviously couldn't watch myself) and I noticed that the sector gear wasn't engaging the tappet plate. I soon fixed this by just turning the sector gear to 1 o clock.

Voila...I can now FINALLY fire my KA M4 for the first time.

Here's a picture of what she looks like...



Thanks again to you all!