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CA m249 fps drop

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Old June 23rd, 2017, 21:49   #1
Ced1942
 
Join Date: Dec 2011
Location: Sept-Îles, Qc
CA m249 fps drop

Hi everyone,

I have a Classic army M249 and last year before storing it for winter i had severe fps drop (normal was about 300fps and now it was shooting 90fps)

So for the last 2 week i tried to find the issue with no luck at all, but i did make some progress but now im completly out of idea so i need your help guys.

First i checked the gearbox, cleaned everything and did compression test. With that i now know my piston/cylinder/cylinder head assembly got perfect compression so no issue on that side and still shooting 100 fps.

Next i went to the hopup unit, felt i was loosing some air in the magwell when shooting. Changed the hop up rubber, added some teflon tape in between the rubber and the steel hopup unit. Put everything back together and no more leak in the magwell i now have around 160 fps.

Then when i did some chrono shot i saw that if i pulled the trigger enough to pre cock the spring but not shoot, wait a second, then shoot, i get my normal 300fps, checked the tappet plate spring and that little guy is still stiff too.

Thats where i am guys, need some opinion im all out of where to search for my problem

Thanks alot!
Ced1942
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Old June 24th, 2017, 20:02   #2
ox56
 
Join Date: Nov 2015
Location: grande prairie alberta
I got a couple of questions for you. When you cleaned everything does that include the inner barrel and the second one is how well does the air nozzle move
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Old June 25th, 2017, 11:44   #3
Ced1942
 
Join Date: Dec 2011
Location: Sept-Îles, Qc
Yes i cleaned the inner barrel like 3 time to be sure.

And for the nozzle it moves fine, no feeding issue at all

Thanks!
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Old June 26th, 2017, 17:11   #4
ThunderCactus
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is the hopup on?
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Old June 27th, 2017, 12:26   #5
Ced1942
 
Join Date: Dec 2011
Location: Sept-Îles, Qc
I was doing my chrono with the hop up off to be sure it was no too tight

Thanks!
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Old June 27th, 2017, 13:33   #6
ThunderCactus
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try turning the hopup on
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Old June 30th, 2017, 10:57   #7
Ced1942
 
Join Date: Dec 2011
Location: Sept-Îles, Qc
Still getting low fps with the hop up turned on.
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Old July 17th, 2017, 19:18   #8
Ced1942
 
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Location: Sept-Îles, Qc
No other idea anyone? Kind of pissed off by this gun right now haha
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Old July 17th, 2017, 19:58   #9
solid1191
 
Join Date: Aug 2006
Location: Markham
Have you inspected the o-ring near the hop up?
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Old July 18th, 2017, 20:42   #10
Ced1942
 
Join Date: Dec 2011
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The one that hold the dial ring? Its fine otherwise i dont
See any other oring
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