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Old January 21st, 2009, 20:04   #1
paulwes83
 
Join Date: Oct 2006
M4 problems

I have an ICS M4 that isn't working. For some reason the BBs won't feed into the hop-up but air is coming out of the barrel so the gearbox is obviously making pressure. I've cleaned everything out and there's nothing jammed. Can anyone suggest what the problem might be?

Problem - bbs won't feed, but gun fires bursts of air out of the barrel.

Thanks all
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Old January 21st, 2009, 20:06   #2
milehigh
 
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I would check the magazine first to make sure its not jammed.
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Old January 21st, 2009, 20:07   #3
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try using different mags
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Old January 21st, 2009, 20:10   #4
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watch inside the loading tube of the hop-up, fire and look for proper loading nozzle movement, if the nozzle is not moving you may have a tappet plate problem, if this is not your problem the mag is not feeding properly , is it a hi mid or locap?
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Old January 21st, 2009, 20:53   #5
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Try a different mag, preferably a highcap. If that still doesn't feed, I'd guess tappet plate is broken.
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Old January 21st, 2009, 22:35   #6
zone 69
 
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Or the nozzle just came out of the tappet plate, I had this happen once.
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Old January 22nd, 2009, 13:39   #7
paulwes83
 
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Sorry, I should've mentioned that I tried multiple mags, regular, full metal, hi-caps, low-caps, so that's not the problem.

Could it be the tappet plate though? I thought that if there was a problem with the tappet plate the gun wouldn't even fire?
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Old January 22nd, 2009, 13:56   #8
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Quote:
Originally Posted by paulwes83 View Post
Sorry, I should've mentioned that I tried multiple mags, regular, full metal, hi-caps, low-caps, so that's not the problem.

Could it be the tappet plate though? I thought that if there was a problem with the tappet plate the gun wouldn't even fire?
All the tappet plate does it retract the nozzel so a BB can load. If it's broken (or disconnected from the nozzel), the nozzel won't retract.
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Old January 23rd, 2009, 07:36   #9
paulwes83
 
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I see. Thanks for telling me that. And thanks to everybody else who's put in their 2 cents. I'll see what I can do on my own as I've never tried to fix a V2 gearbox before, let alone a split style one, but if I can't fix it I'll take it to a higher power.

Thanks again all
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Old January 23rd, 2009, 14:06   #10
ROAR
 
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Goto Mechbox.com they have a video for taking them apart. That video was awesome helped me fix mine!
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Old January 29th, 2009, 06:15   #11
ybrik
 
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It could also be the hop-up chamber. The bb feeding tube of this chamber is not aligned well with the magazine. Check it.
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Old January 29th, 2009, 08:08   #12
screwdriver
 
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a quick check before you strip the gun, i have an ics m4 andits very fussy with different makes of magazine.
when you insert mag fully wound do you hear the mag unwind slightly as the hop up engages with the mag.
if you do all is fine, but on mine it will only feed if you push the mag foward as you fire (after market mags).
to get over this i glued a washer into the recess in the back of the magwell towards the bottom ,this then forces the mag foward when you insert it.
if this aint the problem then as suggested check your tappet plate ,which can be done by removing mag looking in bb feed hole and seeing if it moves when you fire.
tap the trigger and you should see it move all the way back before it releases.
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Old January 30th, 2009, 09:10   #13
paulwes83
 
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Thanks for all the info guys. I opened her up and low and behold a piece of plastic which looks very much like the trangle shaped part of a tappet plate fell out of the gun. So I guess that's what the problem was all along.

Can anybody recommed a good replacement or will any high end tappet plate do?

Thanks again everyone, I'll get her back in the game soon enough.
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Old January 30th, 2009, 10:39   #14
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Quote:
Originally Posted by paulwes83 View Post
Thanks for all the info guys. I opened her up and low and behold a piece of plastic which looks very much like the trangle shaped part of a tappet plate fell out of the gun. So I guess that's what the problem was all along.

Can anybody recommed a good replacement or will any high end tappet plate do?

Thanks again everyone, I'll get her back in the game soon enough.
Modify Polycarb tappet plate V2.
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