Classic army AK making grinding noises on full auto

Tommygun_ted · December 3rd, 2013, 21:42

So I have had a classic army RPK for a few years now but haven't been able to use it. When firing full auto, it sounds like it's making a grinding noise every few shots and the bbs sort of roll out of the barrel, however it fires flawlessly on semi, and dry fires full auto no problem. I've tried cleaning the barrel, but other than that I'm not sure what to do. Any suggestions as to what this could be?

Slow · December 4th, 2013, 01:06

Did you replace the shitty yellow piston that CA has?

Rusty Lugnuts · December 4th, 2013, 06:10

wow, have you tried other mags?

lurkingknight · December 4th, 2013, 11:49

compression jamming... BBs are jamming due to misfeeds or not leaving the hopup chamber and the nozzle has nowhere to go... grinding noise is probably coming from preengagement happening since the air seal is greater than the resistance on the BBs being held in the chamber.

The piston is probably in some shit shape right now, maybe even the tappet fin. On top of that you have the sealing issue that's causing the jam. Could just be due to poor hopup rubber install or major air leak somewhere. Ever get it chronoed?

Tommygun_ted · December 4th, 2013, 18:50

I have tried different mags, and when I had it chronied it seemed a bit low.

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December 3rd, 2013, 21:42	#1
Tommygun_ted Trader rating Join Date: Mar 2009 Location: Shelburne Ontario	Classic army AK making grinding noises on full auto So I have had a classic army RPK for a few years now but haven't been able to use it. When firing full auto, it sounds like it's making a grinding noise every few shots and the bbs sort of roll out of the barrel, however it fires flawlessly on semi, and dry fires full auto no problem. I've tried cleaning the barrel, but other than that I'm not sure what to do. Any suggestions as to what this could be?

December 4th, 2013, 01:06	#2
Slow Loves Furries Trader rating Join Date: Oct 2009 Location: Manitoba	Did you replace the shitty yellow piston that CA has? __________________ If ASC were real life, there would be no Chuck Norris, only CDN_Stalker MANITOBA IVAN

December 4th, 2013, 11:49	#4
lurkingknight "bb bukakke" KING! Trader rating Join Date: Jul 2011 Location: Ottawa	compression jamming... BBs are jamming due to misfeeds or not leaving the hopup chamber and the nozzle has nowhere to go... grinding noise is probably coming from preengagement happening since the air seal is greater than the resistance on the BBs being held in the chamber. The piston is probably in some shit shape right now, maybe even the tappet fin. On top of that you have the sealing issue that's causing the jam. Could just be due to poor hopup rubber install or major air leak somewhere. Ever get it chronoed? __________________ I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.

December 4th, 2013, 06:10	#3
Rusty Lugnuts Fainting Goat, Dictator of Quinte West Trader rating Join Date: Nov 2011 Location: Cobourg Ontario	wow, have you tried other mags?

December 4th, 2013, 18:50	#5
Tommygun_ted Trader rating Join Date: Mar 2009 Location: Shelburne Ontario	I have tried different mags, and when I had it chronied it seemed a bit low.

Classic army AK making grinding noises on full auto

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