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Discussion Starter · #1 ·
Hello all,

I have been working on my friends M4, just doing some basic upgrades wiring etc. and have run into an issue.

The gun is an Ares M4, my friend got it, plinked in the back yard and when he took it to its first game it started double feeding, not feeding and jamming. So wanting to learn to work on a V2 I offered to take a look and do some minor upgrades while I was inside.

I upgraded the wires from 18 to 16gua. installed a Deans plug and did an awesome shimming job (as in, I wish I could get my G36 to hum that smooth). The problem is that once I install the cylinder it starts to get a little crazy.

Here is a good review with good Pics: http://www.airsoftohio.com/forums/showthread.php?t=32414

With everything assembled sans cylinder, piston, spring; it runs smooth and I can see the gears. Once these are installed it runs, pulls the piston back and jams up. It is not an SR25 piston, I checked it when I got it (long story short, the gun is all stock except for the piston (King Arms) and a CA piston head I had laying around).

So thats basically it. I have deduced it down to something to do with the gears to piston connection... I think. Has anyone else had a problem like this? I am just trying to get it running at this point, my friend who's gun it is is not a serious airsofter, so he doesn't want to put a bunch of money into it and I'd really prefer to only buy something if it would be essential to get it running again. Thanks!
 

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Couple things to try. First, when you're shimming, did you shim one gear at a time, ensuring to tighten down all screws and check for wobble/lock up. If not, you want to shim the spur gear first, tighten the box all the way down, check for smooth movement, reopen place, the sector gear in with the spur, tighten the box down, and repeat for the bevel gear, having both the sector and spur gears in place.

If you did that, next question is what battery are you using? A lot of times gearboxes lock up because the battery cannot put out enough power to cycle everything. Try discharging/recharging the battery or using another battery altogether. It helps to try a higher voltage battery in semi-auto.

If that doesn't do it, next thing to check is all the wiring. You want to make sure everything is making a solid contact and not grounding on anything metal. A lot of times it's a simple cut in the protective coating of the wiring that'll cause these problems.

Last thing to try is a different motor. It's quite possible the motor just can't handle it. This can range from needed new brushes, to a defective motor, to a failing motor.

If none of those work, let me know and I can throw some more information your way.
 

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Discussion Starter · #3 ·
Thanks for the reply! I did a proper shim job starting with the spur gear on this one (tried a new technique on my personal V3 box that actually turned out well).

I have contemplated the motor as a possibility. It came with a 9.6 1400mah and I ran it off of my 9.6 2000 mah that I use in my G36 and had the same result with both batteries.

The wiring is good, the reason that I had it apart yesterday was because the first harness I put in was getting torn up going through the barrel nut in the upper receiver, so I replaced the whole thing and put some heat shrink on it to protect it.

I am going to a shop this afternoon to see what their techs think as well, hopefully its nothing major, but it would just confuse me if it can't pull the spring that it was able to pull before if all that has changed is the piston... unless the motor got fried, but even then I would be surprised being Ares and all...
 
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