M4 with issues, need a hand

[Prime]

I have a dboys M4 with some echo 1 parts added on that is having issues.

When it fires, it takes several cycles to get a single bb down the barrel. If you fire with a mag attached, it ends up feeding a bunch of bbs in the barrel until they all come out together.

If you load a single bb manually and fire it a few times, when it actually does come out it is at a very low velocity. The gearbox is basically brand new, and although I put it into an echo 1 body, I have not opened it.

Is there someone here I could take this gun to to take a look at it? Anything that I could check on myself first?

[Lefty]

Off hand i would say the Hop up is to tight or no compresion. Make sure the Hop is all the way out so a BB will roll through when hand loading

[Rico]

You try a different magazine?

[Prime]

It has the problem not using a magazine. I was manually putting bbs in there to eliminate the mag as a variable. I will try adjusting the hopup some. Its weird though, because the gun has almost never been fired.

[SilverGeneral]

I had a similar problem with my BE SL8 about a year ago, the o-ring on the hopup was loose and the tappet plate knocked it in the way of the barrel each time it shot. Take a look at the hopup, and make sure everything is securely attached.

Other than that, it could be a compression issue if the two different brand's parts didn't quite mesh right. Does it sound normal when you dryfire it?

[Prime]

At this point, I think it has something to do with the gearbox. I had it firing alright, but it still got messed up if i tried full auto.

Then it began to die out pow, pow, pow,.... pow.......................pow..................... ............pow

I thought the battery was dead, put in a new battery and you could hear the motor apply torque but it couldnt turn the gears. I then checked the battery that had been in there and it was still good. At this point I would like to put the gun in the hands of someone who can help diagnose an/or repair gearbox related issues. Preferably in the RDU area.

[SilverGeneral]

Someone at Xtreme Kombat does gun work, not sure exactly who though, you might want to give them a call.

And I think Marv might be nearby, heard he does good work too.

[Prime]

So I got impatient and took it apart. Everything looks normal in the gearbox, no unusual wear or obvious problem. The motor however showed some wear on its teeth. Perhaps it was not mounted well? Any tips on ensuring the motor has good contact with the gearbox gears?

[sourcream]

Put everything together, seat the motor, and adjust the screw at the bottom of the pistol grip until it sounds like its firing butter smooth. If it sounds off, or is not firing at all, just adjust it more, dont keep firing.