Skara Posted December 13, 2019 Posted December 13, 2019 Okay, I am about to throw the whole hop/barrel assembly in a dumpster and set it on fire... Stock nozzle, stock chamber, Prometheus blue rubber (no internals from factory), Prometheus bridged flat tensioner, stock barrel: double feeds once every 6/7 shots. In particular it chambers one bb, doesn't fire it, chambers the next and fires both at 5 metres. Same setup but with a 185mm barrel: the same. Same setup but with a modified G&G green rubber, both barrels: Same. Fucking. Issue. What on earth am I missing? It happens both in semi and full auto, with CA midcaps, G&G high cap and G&G drum. Please help
Supporters Adolf Hamster Posted December 14, 2019 Supporters Posted December 14, 2019 Does it do it the same on a freshly filled/wound mag as a near empty one?
Skara Posted December 14, 2019 Author Posted December 14, 2019 That is a test I haven't done yet. Will report later.
Skara Posted December 14, 2019 Author Posted December 14, 2019 Update. With midcaps it fires around 40ish shots before misfeeding. With the stick high cap does pretty much the same. With the drum fully wound it works fine until the spring is almost out of tension.
Supporters Adolf Hamster Posted December 14, 2019 Supporters Posted December 14, 2019 Is she stock speed? I'd normally have expected the opposite- misfeeding on a fresh mag. If it doesnt have one already a sector delayer chip is always a good shout, as is making sure the tappet spring has plenty of strength. That said i wouldnt expect that out of a stock arp box.
Skara Posted December 18, 2019 Author Posted December 18, 2019 I tested it with a 7.4v, which gives a slower ROF than the recommended 11.1s (still misfeeds) What I have noticed is the "firing pattern": it goes 1-1-1-1-1-0-2-1-1-1-1-1-1-0-2 (so it both misfeeds AND double feeds, yay) So there is something that at some point prevents one bb from being fired. When I replaced the nozzle I checked the tappet spring and it was fine. Anything else I shall try?
Supporters Adolf Hamster Posted December 18, 2019 Supporters Posted December 18, 2019 definately no binding on the tappet? ie moves nice and freely if you just press it in from the outside? the only other thing i'd be suspecting is the hop rubber, i've had some issues with misfeeds from maple leaf rubbers due to the longer feedlips, maybe the prometheus you're using is doing the same? thing is that normally manifests with a weak mag spring (eg when a midcap is near empty).
Skara Posted December 18, 2019 Author Posted December 18, 2019 7 minutes ago, Adolf Hamster said: definately no binding on the tappet? ie moves nice and freely if you just press it in from the outside? the only other thing i'd be suspecting is the hop rubber, i've had some issues with misfeeds from maple leaf rubbers due to the longer feedlips, maybe the prometheus you're using is doing the same? thing is that normally manifests with a weak mag spring (eg when a midcap is near empty). Yep, moves freely and smooth as silk. It does the same with a G&G green rubber. I'll try the Prometheus purple when it gets here and an old Ares clear green one as well to check if it's a lip issue.
Skara Posted December 23, 2019 Author Posted December 23, 2019 Okay, I will exclude any hop rubber/barrel issues. Played with some more hop/barrel combinations, including the aforementioned Prometheus Purple and Ares soshititdoesntevenhaveaname one. Also tried a Prowin hop unit but of course it doesn't fit. I only have to play with the nozzle lenght now. I do not have spare nozzles and ordering them would take ages due to festivites. How can I test what lenght would I need without actually having extra nozzles?
Supporters Adolf Hamster Posted December 23, 2019 Supporters Posted December 23, 2019 If its the stock length i'd leave it alone. You could strip the springs from the box, reassemble with the nozzle forward then turn it over to see how far back it retracts. Possibly a worn tappet plate? Might be worth looking when she's open especially if she's got a high round count.
Skara Posted December 23, 2019 Author Posted December 23, 2019 Round count should be around 10k bbs fired since I bought it, add a couple K from the previous owner. I'll pick up a Modify tappet plate and see if I can get a new spring at the local retailer tonight and see what I can do. If that fails, I'll hand it over to a tech.
Skara Posted December 25, 2019 Author Posted December 25, 2019 Of course the arp tappet is proprietary. Ffs. Screw this, I'll take it to a tech.
Supporters Adolf Hamster Posted December 25, 2019 Supporters Posted December 25, 2019 1 minute ago, Skara said: Of course the arp tappet is proprietary. Ffs. Screw this, I'll take it to a tech. Is it? Thought it was just a standard v2 box.... Tbf last time i had one open i was more concerned with picking bits of schredded spring out of it.
Skara Posted December 25, 2019 Author Posted December 25, 2019 57 minutes ago, Adolf Hamster said: Is it? Thought it was just a standard v2 box.... Tbf last time i had one open i was more concerned with picking bits of schredded spring out of it. The plate is narrower than a standard v2 modify one towards the nozzle, by a lot. It's like a third of the width, and the shell is different.
Supporters Adolf Hamster Posted December 25, 2019 Supporters Posted December 25, 2019 Makes sense, musta just not picked up on it when i was in there. Tbf if it aint broke and it aint my gun i have a habit of not fixing it.
Skara Posted January 11, 2020 Author Posted January 11, 2020 Turns out to be a magazine issue. I need to change all the springs...
Skara Posted April 13, 2020 Author Posted April 13, 2020 Let's necro! Having some free time I disassembled the mags and gave them a nice clean. Somehow things have worsened, as they now feed ONE bb per mag. New springs it is then.
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