I think I broke my P90...

[Fullmetalferret]

Oh, boy where do I begin? I think the problem with my gun was when I was trying to break in the magazine by putting lubricant on the springs to make it so the bbs would feed better, this probably caused some lubricant to slide into the feeder which made my gun shoot like it had no hop up, and so being the genius that I was decided to take apart the gun and clean it which lead to my predicament.

So what happens is that now my gun can't shoot in semi anymore and will shoot full regardless if its on automatic mode or semi, however the safety works fine. The gun shoots like it has no hop up and even when shooting any adjustments to the hop up will cause bb's to travel the same regardless of how far you turn it, and when it does shoot bb's will start spraying out of the barrel and some will roll right out.

[Styrak]

Take it to someone who knows what they're doing.

[Fullmetalferret]

Yah, I was thinking of sending it out to like buyairsoft.ca once I get a reply from them. The one thing I'm worried about is the cost of repair exceeding the gun itself.

[Thenooblord]

good luck with that

[Short Round]

Two things.

First that rod that connects/pushes against the front of the gun (trigger) to the front of the contacts (front of the gearbox) wrap tape around the end of the rod (the part that is actually pushing against the gearbox). Duct tape or electrical tape is your best bet. Wrap enough around the end of the rod till your semi returns, put too much on it you will only get full auto, too little and you won't be able to shoot semi.

Also make sure your gearbox is correctly aligned in the gun, just take the gearbox out and place it back in till it is firmly in place.


Now for the hop up, take a cleaning rod with a paper towel or swob and clean out the barrel, turn off the hop up and push the rod GENTLY through the entire barrel and hop up unit. Yes people say don't do this however as long as your gentle doing so, and don't force it in quickly and you won't tear the rubber.

The reason why you do this is cause you want to create as much friction between the rubber/hopup nub and bb as possible. Just think about it, cause you greased your magazines now every time you put bbs through it the bbs pick up a layer of oil/grease which rubs again the inside of the rubber where the nub pushes down. When that happens, cause there is no friction it causes the bbs to shoot out of the barrel with no "hop" (no spin that causes the bb to fly upward).

Overall, clean out the barrel and inside of the rubber. Wrap tape around the end of the trigger rod, and remove and place the back in the gearbox itself till you think it is full aligned correctly in the gun.

You don't have to take apart anything in the gearbox itself, unless these methods do not fix your gun, which in that case take it to a gun doc. If you notice it fixes your problems but you have a fps drop now, or any other problem (s) then take it to a gun doc. If you don't feel up to doing these methods take it to a gun doc. Nothing wrong with doing that, I would even myself because there is only so much I know about P90s and V6s. A gun doc should be able to pin point the problem if they know what they are doing so look for one on ASC, there is a list/ thread that has various gun docs across Canada, should be able to find one in your city.

I have experienced these problems when I took apart my P90, took it to a gun doc after many of my failed attempts. I still encounter some of these problems when I do a basic breakdown though, so maybe once it is fixed don't open the gearbox yourself haha you'll do more damage then good if your like me and no nothing about how to get a complete airseal.

If you need more help PM me. Good luck

[lurkingknight]

what brand of p90 is it?

semi on p90s has always been finicky. Did lubing the hopup, and you subsequently splitting the upper off the body break the semi? It's unlikely. The upper and barrel assembly don't really have anything to do with how the semi functions.

It's more than likely your cutoff lever on the side of the gearbox was starting to wear and it's a coincidence that you lost semi function as a coincidence while you were troubleshooting your hopup. Unlike every other version gearbox the v7 cutoff lever is always being activated in a p90, where as in v2/3etc when you switch to full auto the lever actually gets pulled out of the way so the sector gear doesn't make contact. The lever on the p90 will wear very quickly. There is only 1 replacement on the market from prometheus at 40ish$

let's treat the bigger of the problems first. IF all you did to try and fix the hop was remove the upper off the body, then do as short round suggested. Take your cleaning rod and clean your barrel and hopup... VERY gently. This includes trying to wipe off whatever lubricant you used. it obviously made its way out of the mag and smeared itself all over your hopup rubber. Once you properly dry your rubber, retest your hop to see if it's returned.

To troubleshoot your semi, well you can take it to a gun doc which I suggest over shipping it back to the vendor for service. I don't know how BA has on staff to tech, but asc has lots of people who are probably just as if not more qualified... depending on where you are. It will involve the removal of your gearbox from the body, which is only 2 screws, but you can screw things up if you're not careful. The good news is that the cutoff lever is really easy to get to and easy to change, but you need to properly diagnose the issue, it might not be the lever at all, but imo it's the likely culprit.

[ThunderCactus]

I just hit the side of P90s to get semi working again, but not everyone has my magic touch lol

lesson #1; you don't ever, ever, not even once, ever have to lube your mags, ever. At some point in time they may have to be cleaned, but not ever do they have to be lubed for any reason.

lesson #2; the hopup works on the principles of friction, if it becomes lubricated, it loses all functionality.

lesson #3; if you have any kind of issue with your gun, it's always best to (first) google the issue, and if you can't find a definitive answer come ask us. There's a good chance your misfeeding is caused by the quality of your ammo or something other than the mag itself. Or perhaps it's just a bad mag. Either way, lubing it was definitely not the right thing to do.

hard lesson #4; don't take a gun apart unless you have some kind of road map or idea of what you're doing.

Now clean the barrel out with windex and make sure it's nice and dry, there should be no lubricant of any kind ever inside the barrel, they're meant to run totally dry. And somehow you'll need to clean the excess lube out of the mag. The lube will get on the BBs and from there into the barrel.

[Kos-Mos]

Before trying to tape stuff and all, make sure that your mechbox works properly.
With the mechbox out, put some tape on the two contacts under the trigger. Now connect everything and press the trigger. It should fire once only.

If it works, remove the tape and proceed next. If not, bring your mechbox to a gundoc or try to take it appart yourself. It has something to do with the long connector on the side of the mechbox (cut-off lever).

Take the receivers appart.
There should be a metal frame connected to the trigger, and going at the back.
Unhook it from the trigger.
Then remove the mechbox and pull the frame out the back. Notice how it goes out.
It will be shaped like a hockey stick. You would want to bend the short end a little more.
Right now you get full auto all the time because the first stage of the trigger pushes the electrical trigger too far.
On the P90, there is no actual selector. There is two electrical triggers on the mechbox, and only the first is actuated by the cut-off lever/semi-lever. Your issue is that when you press the trigger in semi, it connect both switches, so even if your mechbox tries to stop, it still fires.
You have to be very careful everytime, and only bend it a tiny bit. Reassemble and test each time. If you bend it too much, you won't fire in semi and/or fire semi in auto.

[Styrak]

Buyairsoft should be the last place you send it.

[ILLusion]

The cutoff lever in the v6 gearbox is notorious for wearing down, which prevents semi-auto fire. I have both OEM Tokyo Marui replacement, as well as upgraded stainless steel replacements available. This should resolve the issue of not being able to fire semi-auto.

[GBBR]

-UPDATE-


The "trigger rod" was bent. so much so that it was engaging the electronic trigger a little too much causing it to turn into full auto.

was remedied after bending the rod inward by 1mm and also shimming the placement on the trigger.



As for his hop up.

It was torn and was installed upside down.

[lurkingknight]

are you talking about the rear trigger prongs? they often do come from factory too far forward on the switches... sometimes they do engage at the same time as the semi.