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Discussion Starter · #1 ·
I have a heavily upgraded utg l96, the only part that is fairly crappy is in the cylinder, I have the cheap upgrade kit by utg. I have a metal triggerbox and reinforced heat treated sears from airsoft gi, but when I pull the bolt back, sometimes it will catch, but alot of times it wont catch, or it will and then the trigger will pull and wont shoot the rifle, then I will have to pull the bolt a few more times and slam it forward to findally get the trigger 'cocked' and then it will shoot. My main question is, are the sears to blaim, or is it the piston? The triggerbox looks fine, it's reinforced and no cracks or stress marks. I hope it's the piston because I was going to get a new one soon anyways. My other question is about a bucking, I have the pdi W hold bucking in the pdi chamber, should I get another W hold bucking, or should I switch over to a systema bucking? Also should i get the pcs nub? will it work in the pdi chamber?
 

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The Echo1 UTG Upgrade Kit's metal piston isn't a 90 degree piston and wears out much faster than PDI/Laylax pistons.

Aps2/type96 aftermarket sears are ideally made for 90 degree pistons so why Echo1 decided to make a 45ish degree piston eludes me.

Even the stock plastic piston is 90 degrees :ashamed:

I would highly recommend swapping in your stock piston for now, assuming you still have it in working condition, and see if that fixes any of your problems.

If everything is fixed at that point congratulations.

However, if the problem persists...

From what you described, it sounds like you may have an issue with the trigger box instead (or both).

  1. Is the bolt push forward smooth or very hard?
  2. Does it ever slam-fire?
  3. Are you using a stock trigger assembly with airsoftgi sears? If so, did you install it yourself?
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I hope it's the piston because I was going to get a new one soon anyways.
Definitely. Which piston were you going to get?

My other question is about a bucking, I have the pdi W hold bucking in the pdi chamber, should I get another W hold bucking, or should I switch over to a systema bucking? Also should i get the pcs nub? will it work in the pdi chamber?
First off, do you have an AEG barrel? If you know for a fact you have an AEG barrel then a Systema bucking+ PCS/SCS[same] nub will work. A PCS/SCS nub is highly recommended because it can maximally perform using only a few buckings and Systema happens to be one of them. Shredder--the maker of the SCS nub said it himself.

This is only from what I have encountered, but way more people use the Systema/SCS nub combo over any other bucking+nub combination. That doesn't mean it's the best, but many others personally prefer it. I'm using it, but I haven't had the chance to test many other combinations so I can't say it's my favorite. Perhaps my favorite at the moment :D

Any AEG bucking will work with any nub in the PDI chamber as long as you have an AEG Inner Barrel.

Just to make sure, what inner barrel are you using?
 

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Discussion Starter · #3 · (Edited)
I have a prometheus 6.03 509mm barrel, so yes it's an aeg barrel, and as for the trigger box, it pretty much is the metal triggerbox from airsoft gi's website, it has the heat treated sears in it, and I currently don't have the old piston, the piston I was thinking of getting was the King Arms reinforced piston

http://www.evike.com/product_info.php?products_id=35240

and the angel custom piston head on evike, since its a copy of the laylax one, and I'm on a budget so thats why I'm not getting the laylax parts, also would these parts work with the metal spring guide and spring that came with the upgrade kit I have?

And as for your 3 questions.
1. It usually is pretty easy to push forward.
2. No slam fires.
3. The triggerbox like I said further up in this answer is from asgi, they istalled the whole trigger assembly with the heat treated sears in them.

Oh I just found another piston that could be a possibility, it's the angel custom piston for the l96 on evike, it looks like another copy of the laylax, so I'm not sure if I should get that or the King arms. Oh by the way my sniper is shooting at 550 fps with .2s, so that should help on what piston to get.
 

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Thanks for being detailed with your responses.

I owned both a Laylax Piston and an Angel Customs piston and they are the same specs. In my opinion, it's a green light to buy the AC piston if you want to save money over the Laylax. Nobody that I know of in real life or online have had a complaint with this particular piston. If you do end up buying the AC Piston or the Laylax Piston, buy the Laylax Red Accuracy Cup. The Angel Custom's Piston Head has a bad air seal and I would advise against it. ~15-30 FPS loss/inconsistency

Both the Laylax/AC piston has shot 729FPS at one point in my gun.
680-689FPS average during a session where I was tweaking my gun for maximum FPS (data collecting not skirmishing). This means both pistons can take a beating. I don't have experience with the King Arms Piston, so unfortunately I don't know its tolerance.

Since you have the same TBB as me, the Systema bucking+PCS will do you justice.

I would recommend doing #1-3 all at once and then try firing the gun and see how it shoots. If that doesn't do anything, do #4. Then #5 if those fail.

1) Tighten the screw at the back of the bolt.
2) Tighten the two screws where the trigger assembly and the metal receiver meets. These screws should not be loose at all.
3) Make sure the firing pin is pushed in all the way
4) Remove the piston from the cylinder and turn it 90 degrees (either direction) so it's basically 1/4th way turned from its original position. Place the piston back into the cylinder.
5) Remove all the bearings from the spring guide.

If it's shooting the same after doing #5, I hope your new piston fixes the issue. It MIGHT fix the problem, but it's not guaranteed. I have a strong feeling it's combination of the piston and a spring in the trigger assembly that's either snapped or out-of-place. I'm giving AirsoftGI the benefit of the doubt, but your symptoms don't out rule the trigger assembly. The only way to know for sure without having to buy a piston is if you opened up the trigger box, but that might void the warranty assuming there is one.

If there is a warranty, I would send it back if #1-5 fails, and even a new piston fails.
 

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Discussion Starter · #5 ·
I just got it back not long ago because there was a bent spring in the triggerbox, and where the piston catches is a very small area, like you said 45 degrees, and it almost looks like metal shavings are coming off the POS piston. I'd like to not send it back because they lost a few pieces of my pdi hop up and my gun was away for over 3 weeks. I think I'm gonna go for the AC piston, and when I said AC piston head I meant the copy of the laylax cup that AC makes, is that the one you were talking about? My main reason for thinking its not the trigger box is just because I got it back all fixed probably a week and a half ago, so I dont know how a spring could get bent like that in such little time.
 

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The piston head you want to buy is this one:
http://www.evike.com/product_info.php?cPath=648_656&products_id=25844

As for the trigger assembly... I'm not sure how the AirsoftGI version works so I can't say for sure that it is a spring issue. A spring inside the box can snap due to the sheer power of a gun or just misfortune.

I first bought a zero trigger thinking I would never have to worry or fiddle with it ever again-- especially after everyone's recommendation and the price of the item itself. Guess what?

Three days later a spring snapped. The gun wouldn't function without it.

I ended up fixing it soon after. But yes, trigger box springs take A LOT of stress and may break. Some people have their trigger box last years with no issue. Others are not so lucky. Btw, I was shooting ~450FPS when the spring broke :bs:
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I wouldn't send in your whole gun yet.
First get that piston and cross your fingers.
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I just got it back not long ago because there was a bent spring in the triggerbox
Do you mean AirsoftGI found a bent spring and fixed it? Or you found out right now that there's a bent spring? Or...?

Also did you try what I recommended? If so, how did it go?
 

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Discussion Starter · #7 ·
I meant airsoft gi found a bent spring and fixed it. I have not put the cylinder back in the gun yet because I want to just wait until my new piston comes to see if that fixes the problem, I needed a new one anyways, and I don't want to damage the gun any further. And the trigger assembly is the same as the stock one, it is just metal, so all the same parts and everything.
 

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Understood. Keep us posted after you get your piston :tup:
 

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Discussion Starter · #10 ·
How would I go about checking to see if thats backwards? I've never heard of that problem, so I may need just a quick walk through to understand it, thanks for all of your guys help!
 

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When the gun's muzzle is pointing away from you, place your finger/thumb into the open area which is in front of your trigger. Feel the side of the spring guide stopper that's facing opposite the muzzle. There is usually a lever or some type of metal which enables you to pull it down without having to disassemble the gun.

If you do not feel any sort of lever or metal to pull it down then AirsoftGI may have assembled the spring guide stopper backwards.
 

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Discussion Starter · #12 ·
Oh! You mean the firing pin? I've taken it out quite a few times and put it back in, it's not backwards. And i was wondering, if there dooes end up being a broken or bent spring in the triggerbox, how would i replace the spring?
 

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It requires a spring which can be found in a Version 2 AEG spring kit. Usually runs around 6-8 dollars.

Someone mentioned (I'm not sure where I read it because it was a long time ago) that you can use the spring found inside of a clicky bic pen.
I never tried it so I wouldn't know.

As for installing the spring, I know there's a guide somewhere online which will teach you how to install it.

Let's just hope the piston fixes the issue.
 

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Discussion Starter · #14 ·
Yeah I hope its the piston too, I'll post the results of the new piston once I get it which will probably be friday. Thanks for all the help!
 

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Discussion Starter · #17 ·
Mission accomplished! The piston fixed the problem, gun works great now, I put in the systema bucking and scs nub, after I zero in the scope we'll see how accurate it is, the scs nub is really small though so I'm not sure if it will work good, but I hope so.
 

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Congratulations on fixing your problem :)

The SCS nub is small, but it's proven to work wonders.

Hopefully it works out well for you.
 

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I have a metal triggerbox and reinforced heat treated sears from airsoft gi, but when I pull the bolt back, sometimes it will catch, but alot of times it wont catch, or it will and then the trigger will pull and wont shoot the rifle, then I will have to pull the bolt a few more times and slam it forward to findally get the trigger 'cocked' and then it will shoot.
From the 1st page.
 
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