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Post by leafspots on Jun 13, 2017 22:49:43 GMT -5
So recently I've gotten ahold of an agm mp44 that has been upgraded a bit: m100 spring, cyma m4/16 hopup, 420mm tightbore barrel. But! upon testing I first realized that there were feeding problems, the metal plate that was above the hopup was missing and was not feeding at all. So I cut a metal piece to fit the size of the charging handle space where the previous metal piece plate was and fit it there. then it seemed that the air nozzle was not rebounding back and forth so I took apart the gearbox and fixed that problem, no compression issues what so ever. After that it fed correctly but the bbs only were able to reach up to 3 feet..if that!
I have ideas on what to do like replacing the hopup but I'm not so sure that might be the solution. Never had I had a problem like this and would like to have some advice from people who possibly have more experience on tackling these problems.
thank you,
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adrg
Private
Posts: 211 
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Post by adrg on Jun 13, 2017 23:33:26 GMT -5
If you have proper compression in the gearbox (and I guess you checked when fixing the tappet plate) my best shot will be an issue in the Hop-up unit. If you have an M4 or another STG you can just try and swap hop-u units and inner barrel assembly just to be sure there is no other issue.
You can inspect if the inner barrel has any any protrusion from the bucking (look into the light😀).
Next - try to rebuild the hop-up and eventually change the bucking with another one. My prefered is G&G green bucking.
If still issues - it is possible you have an incompatibility between inner barrel/ hop-up and bucking.
If you still have the orriginal inner barrel - you should check if the hop-up cut or guidance cuts are at the same distance from the end as the new inner barrel. Sometimes there are some tolerance there that are compressing the hop-up bucking into the hop-up chamber so the whole assesmbly is just not compatible.
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Post by leafspots on Jun 14, 2017 1:01:49 GMT -5
If you have proper compression in the gearbox (and I guess you checked when fixing the tappet plate) my best shot will be an issue in the Hop-up unit. If you have an M4 or another STG you can just try and swap hop-u units and inner barrel assembly just to be sure there is no other issue. You can inspect if the inner barrel has any any protrusion from the bucking (look into the light😀). Next - try to rebuild the hop-up and eventually change the bucking with another one. My prefered is G&G green bucking. If still issues - it is possible you have an incompatibility between inner barrel/ hop-up and bucking. If you still have the orriginal inner barrel - you should check if the hop-up cut or guidance cuts are at the same distance from the end as the new inner barrel. Sometimes there are some tolerance there that are compressing the hop-up bucking into the hop-up chamber so the whole assesmbly is just not compatible. Okay thank you very much. Though I do not have an M4 or a spare STG, I will rebuild the hopup and purchase the G&G green bucking. If the problem continues then I will follow the instructions you gave below. |
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adrg
Private
Posts: 211
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Post by adrg on Jun 14, 2017 5:53:00 GMT -5
Visual inspection might be also good. If there is anything protruding when Hop is completly removed this is tour best bet.
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Dracul
Master sergeant 
Posts: 1,341
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Post by Dracul on Jun 14, 2017 8:19:26 GMT -5
If you are going to order a bucking at all, it will better if you just order a new M16 hopup (try to get an assembled metal one) unit as well.
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Post by kingmaker on Jun 15, 2017 5:44:15 GMT -5
Hi check that the hop rubber lips, where it meets the nozzle, is level with the edge of the hole that the ammo feeds from the magazine
pop YOUR ANTI reversal latch so the nozzle is fully forward and offer up the hop unit you should be able to feell the nozzle touch the rubber before the hop unit tooches the gearbox case.Nozzle should overlap about 1.5mm with the lips of the rubber.
Is the hop rubber and barrel all the way into the chambre,the slots in the barrel need to align with the barrel clamp properly.when inserting barrel to chambre make it tight fit with ptfe tape
Your nozzle may be rubbing on the walls of the hop chambre stopping free movement,this can cause bad feeding and bad air seal,i have about 10 m4 hop units they dont allways work in every gun.
Hope you get it fixed i know it can be frustrating sometimes.
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Post by kingmaker on Jun 15, 2017 6:54:33 GMT -5
The element red chambre has been good for me,the geared wheel type,the prowin rotary copy ,by element ,in plastic is crap,cant get that to work at all.
You could just try re-seating the hop rubber you have in the chambre,once it starts to slide in keep it aligned,with the barrel window at 12'o clock exactly,and dont do any more twisting of the barrel as it may cause the rubber to deform between the barrel and inner chambre walls.
Cyma hop rubbers i have used have been as good as anything else,but with cninese stuff you dont get batch to batch consistency.
I believe this gun has problems with the hop chambre fouling inside the reciever,do some more research on this.
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Post by chris090 on Aug 14, 2017 21:14:44 GMT -5
I am happy that I find my own answer here. |
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