bankz5152 Posted August 14, 2017 Report Share Posted August 14, 2017 How do I do that? Quote Link to post Share on other sites
renegadecow Posted August 14, 2017 Report Share Posted August 14, 2017 Pull and hold transfer bar of trigger pack all the way back. Pull back hammer to lock. Push auto sear forward and hammer should release. 1 Quote Link to post Share on other sites
bankz5152 Posted August 14, 2017 Report Share Posted August 14, 2017 Ok shall do Quote Link to post Share on other sites
bankz5152 Posted August 17, 2017 Report Share Posted August 17, 2017 So full auto kinda works now... If I pull the trigger back and rack it full auto engages, release trigger and pull again still got full auto. However not if I rack it with the trigger forward just becomes bolt action again. Semi is still fine. Quote Link to post Share on other sites
renegadecow Posted August 17, 2017 Report Share Posted August 17, 2017 I can't remember exactly when and by who but I distinctly recall someone having cycling issues sounding similar to yours. It was caused by the trigger bar binding somewhere around the internal gas tank and was fixed by simply straightening things out. The hard part was finding the area. 1 Quote Link to post Share on other sites
bankz5152 Posted August 17, 2017 Report Share Posted August 17, 2017 Possible! I'll strip it down and check. Not too concerned as I rarely use FA anyhow but I'd like it there Quote Link to post Share on other sites
Vasriotaep Posted September 13, 2017 Report Share Posted September 13, 2017 (edited) Hello, well, I get back my P90, I was frustrated to fail to solve its problems. So in order: -Mag gas leak: fixed again, not used without grease during more than one year, bad for o-ring. -Gas tank leak: happened today, will fix it easily -Double feed: already fixed -No feed: already fixed -Trigger pressure: fixed by sanded the trigger bar (I have the z-parts parts installed) -Full auto instead of semi: fixed by adjust the trigger bar extremity -Low fps: fixed by using another nozzle and cuted little lugs inside the nozzle, now 370fps instead of 300fps -Bad range: fixed thank to the new velocity, but not amazing (around 40-45m) -Bad accuracy: not fixed, and I don't know how to increase it => For this problem, I use a Modify hop-up rubber and for the nub, a lollipops rod. To resume, when I shoot, one bb go straights, the other up, the other down, left, right, left, up, etc etc... Why does it happen??? Edited September 13, 2017 by Vasriotaep Quote Link to post Share on other sites
DarkLite Posted September 13, 2017 Report Share Posted September 13, 2017 Hello, well, I get back my P90, I was frustrated to fail to solve its problems. So in order: -Mag gas leak: fixed again, not used without grease during more than one year, bad for o-ring. -Gas tank leak: happened today, will fix it easily -Double feed: already fixed -No feed: already fixed -Trigger pressure: fixed by sanded the trigger bar (I have the z-parts parts installed) -Full auto instead of semi: fixed by adjust the trigger bar extremity -Low fps: fixed by using another nozzle and cuted little lugs inside the nozzle, now 370fps instead of 300fps -Bad range: fixed thank to the new velocity, but not amazing (around 40-45m) -Bad accuracy: not fixed, and I don't know how to increase it => For this problem, I use a Modify hop-up rubber and for the nub, a lollipops rod. To resume, when I shoot, one bb go straights, the other up, the other down, left, right, left, up, etc etc... Why does it happen??? Sounds like you didn't replace the stock WE barrel? The newer WE GBB barrels and hopup rubbers have different internal measurements than TM (and old WE) GBB spec, but have the same external measurements. What this means is that it's possible to install a TM spec hop up rubber on a WE spec barrel, which leaves a small gap inside that can't be seen from the outside - causing issues like the ones you describe. Either stay with the WE spec barrel and hop up rubber or get a new barrel to go with your hop up rubber. Mapleleaf's new 'Crazy Jet' barrels are good, I hear. Quote Link to post Share on other sites
Vasriotaep Posted September 13, 2017 Report Share Posted September 13, 2017 Of course I had to forget one thing lol I put a new inner barrel ^^ Quote Link to post Share on other sites
Zereck Posted September 13, 2017 Report Share Posted September 13, 2017 -Bad accuracy: not fixed, and I don't know how to increase it => For this problem, I use a Modify hop-up rubber and for the nub, a lollipops rod. To resume, when I shoot, one bb go straights, the other up, the other down, left, right, left, up, etc etc... When I first got my P90 I read the suggestion to file down the front tab(part 98) that holds the bb in place, which supposed to fix double feeding issues. I did this even tough I never had double feeding and after that I had the exact same problem with the hop-up as you. After I replaced the tab the accuarcy was fixed. I amd using Maple Leaf diamond currently. I never had any double feeds since I have the gun btw. Also Im not sure about the whole oil in the gas thing. Im am using pure propane for years I have WEs, GHKs, Maruis and rarely if ever got a leak and it was usually fixed by switching to a new o-ring. Only the P90 seems to leak more easily, but your video about sealing worked for me, so thanks. Quote Link to post Share on other sites
Vasriotaep Posted September 13, 2017 Report Share Posted September 13, 2017 No problem for the tips So for you, the part 98 is the cause of the bad accuracy? I will check. Quote Link to post Share on other sites
Vasriotaep Posted September 14, 2017 Report Share Posted September 14, 2017 Wow now the gas tank leaks from everywhere, I'm good to make a full disassembly again! Great... I have analysed and checked the part 98 and everything around the hop-up unit without finding something suspect. The part 98 seems not play any role on the accuracy of the gun Quote Link to post Share on other sites
Vasriotaep Posted September 14, 2017 Report Share Posted September 14, 2017 Well gas tank leak fixed, like others leaks, no maintenance during stockage so dry o-rings. I also find from where this little part which fell when the gun has been buy should go: It's a part of the buffer at the rear of the gun. Someone has the same problem at the very begining of this thread but it seems not related with my poor accuracy. Quote Link to post Share on other sites
Pimpbot Posted September 16, 2017 Report Share Posted September 16, 2017 I still can't believe there isn't an aftermarket red-dot upper receiver for this yet... Quote Link to post Share on other sites
Zereck Posted September 16, 2017 Report Share Posted September 16, 2017 Maybe it's not popular enough? BTW I have some weird FPS inconsistency and not the usual for gbbs. My shots can go like this: 1. 370 FPS 2. 401 FPS 3. 310 FPS 4. 350 FPS 5. 340 FPS 6. 380 FPS 7. 340 FPS 8. 400 FPS and so on. But everything seems fine. Both the bolt and the nozzle moves smoothly the latter has good sealing(tough I can feel the air going out where the pin is that holds the spring. Is that a problem?). The nozzle pin also seems fine. In face the range and accuarcy was consistent for me so I don't know. The chronograph can't be wrong as it measures other gbbrs fine. Quote Link to post Share on other sites
Dimitri MdP Posted September 16, 2017 Report Share Posted September 16, 2017 If you're loosing air though the pin, a tiny drop of thread locker (LOW torque) will help seal it. The WE P90 is known to be one of the most consistent GBBRs ever, if not the most consistent, due to the internal gas reservoir acting as a sort of expansion chamber. So the inconsistency you're experiencing is a clear sign that something is wrong. It might be: 1) The floating valve failing to do it's job. If you're running NPAS, then that's your problem. If running stock floating valve, check the status of the valve and the spring, and make sure the valve is sealing when it's on the forward position. 2) The nozzle prematurely disconnecting from the hop chamber. Sometimes the nozzle will disconnect immediately from the chamber, so you'd be venting a lot of gas directly to the atmosphere instead of routing it to the blowback. Normal operation should make the bolt carrier move but the nozzle only disconnect from the chamber when it reaches max separation from the carrier, and only then retract. Check if the nozzle is able to move freely in the bolt carrier and able to return just on spring tension, and function check for the nozzle to stay in the chamber until the right time. If not, a Maple Leaf Autobot bucking greatly helps to achieve that. Quote Link to post Share on other sites
Aaronunuri Posted September 18, 2017 Report Share Posted September 18, 2017 I cant wait to get my dirty mitts on some of these. The final piece to complete the CX4.EXCELLENT review guys and great pics. Thank you for sharing. Quote Link to post Share on other sites
Zereck Posted September 22, 2017 Report Share Posted September 22, 2017 If you're loosing air though the pin, a tiny drop of thread locker (LOW torque) will help seal it. The WE P90 is known to be one of the most consistent GBBRs ever, if not the most consistent, due to the internal gas reservoir acting as a sort of expansion chamber. So the inconsistency you're experiencing is a clear sign that something is wrong. It might be: 1) The floating valve failing to do it's job. If you're running NPAS, then that's your problem. If running stock floating valve, check the status of the valve and the spring, and make sure the valve is sealing when it's on the forward position. 2) The nozzle prematurely disconnecting from the hop chamber. Sometimes the nozzle will disconnect immediately from the chamber, so you'd be venting a lot of gas directly to the atmosphere instead of routing it to the blowback. Normal operation should make the bolt carrier move but the nozzle only disconnect from the chamber when it reaches max separation from the carrier, and only then retract. Check if the nozzle is able to move freely in the bolt carrier and able to return just on spring tension, and function check for the nozzle to stay in the chamber until the right time. If not, a Maple Leaf Autobot bucking greatly helps to achieve that. Hey! I sealed the pin and polished the bolt and its rails. Also installed a ML Autobot 60 degree(just had one lying around). FPS consistency is much better now, thanks for the suggestion! Tough there is some randomness in accuarcy after 55m(tough that maybe just the new hop-up). 1 Quote Link to post Share on other sites
Dimitri MdP Posted September 22, 2017 Report Share Posted September 22, 2017 Hey! I sealed the pin and polished the bolt and its rails. Also installed a ML Autobot 60 degree(just had one lying around). FPS consistency is much better now, thanks for the suggestion! Tough there is some randomness in accuarcy after 55m(tough that maybe just the new hop-up). Good to hear that. About the accuracy, which barrel and which nub are you using with that Autobot bucking? Quote Link to post Share on other sites
Zereck Posted September 23, 2017 Report Share Posted September 23, 2017 Im using an Angry Gun barrel(old style hop-up window), with the hop-up window enlarged. Nub is a Prometheus flat one slightly cut in length. Quote Link to post Share on other sites
Dimitri MdP Posted September 23, 2017 Report Share Posted September 23, 2017 Try with the OEM nub, or better yet find a Maple Leaf concave one. In my experience Maple Leaf buckings never really go well with Prometheus flat nubs. Quote Link to post Share on other sites
Vasriotaep Posted October 2, 2017 Report Share Posted October 2, 2017 Hi there, let me show you my last game with a fully workable p90 ^^ after so much work! Quote Link to post Share on other sites
Zereck Posted October 5, 2017 Report Share Posted October 5, 2017 Finally got to try with a concave nub and the result were the same. Shots either having too much hop-up or not enough and a few times normal. I don't know what could cause this as everything else seems fine. :S Quote Link to post Share on other sites
Dimitri MdP Posted October 5, 2017 Report Share Posted October 5, 2017 I'm gonna ask the painfully obvious... have you tried different bbs? Quote Link to post Share on other sites
Zereck Posted October 6, 2017 Report Share Posted October 6, 2017 I didn't. I was using BLS. However I switched back to the older ML bucking and with concave nub it gave me much better results(very few fliers). Im gonna try other BBs tough. Quote Link to post Share on other sites
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