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KM4 Feeding Problems


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#1 Max Toulouse

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Posted 05 May 2014 - 02:03 PM

I've had this rifle for about a year now and it's only recently been having feeding problems, albeit having a swollen hopup nub and bucking being replaced by a G&P Durable bucking and nub. I'm not quite sure what could be causing the issue. I'm using MAG brand 100 round midcaps and the first 20-30 rounds on semi either don't fire, double fire, or roll out the barrel about 10 feet. On auto, it just spits them out 10 feet. If I remove the mag and fire more, the gun does start to shoot normally but I really wish I could get proper feeding in my weapon. Any help would be greatly appreciated.

#2 Eman Resu

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Posted 05 May 2014 - 04:39 PM

Check to see if your hop up still has the little spring that goes on the front. If that's missing, then it might be causing the hop up chamber to sit too far forward. This would explain the mis-feeding and low BB velocity, as well as the inconsistency in the feeding.

Alternatively, it could be a tappet plate issue; that too would explain both the mis-feeding and the BBs only traveling 10ft. Try taking off the upper receiver and cycling the gun to see if the air nozzle is moving normally. If the air nozzle isn't behaving like it should, the problem might be a worn down tappet plate.

#3 BLATEY

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Posted 05 May 2014 - 07:17 PM

View PostEman Resu, on 05 May 2014 - 04:39 PM, said:

Check to see if your hop up still has the little spring that goes on the front. If that's missing, then it might be causing the hop up chamber to sit too far forward. This would explain the mis-feeding and low BB velocity, as well as the inconsistency in the feeding.

Alternatively, it could be a tappet plate issue; that too would explain both the mis-feeding and the BBs only traveling 10ft. Try taking off the upper receiver and cycling the gun to see if the air nozzle is moving normally. If the air nozzle isn't behaving like it should, the problem might be a worn down tappet plate.

Yes, try this. Also, push in on the nozzle and make sure it moves freely(shouldn't be wobbly but firm and stiff when pressure is applied).

#4 kwaispro727

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Posted 06 May 2014 - 05:10 AM

What BBs are you using? I have come across some VERY strange problems including one similar to this just because an obscure brand of BBs was being used.  Sometimes even with reputable brands weird crap happens.  I gave some Lonex flash mags to my friend for his birthday when he got his SR7, and the BBs barely fed, like one shot out of ever 20.  The reason? Goldenball BBs.  I gave him some of my KSCs and everything worked beautifully.  Biovals also work.  I recommend sticking to brands that have slightly smaller diameters, like KSC or Bioval.  I think Elite Force also down sizes slightly compared to Goldenball or Madbull.

#5 BLATEY

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Posted 06 May 2014 - 07:16 AM

I love using King Arms and elit force bbs since they're so cheap and feed very well. Never had a mis feed in any of my gun while using these.

#6 Larry

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Posted 06 May 2014 - 08:06 AM

Did it start right after you installed the bucking.

#7 gcw360

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Posted 10 May 2014 - 06:10 AM

Also, check the wire harness at the front of the gun to ensure:
  • It's not blocking proper feeding
  • It's not causing the feed ramp to be misaligned





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