Hello, i'm new here, also my guarder kit is making me mad

[Auhydride]

Hello, i have a tokyo marui mp5, and bought a sp120 guarder kit, after paying 150$ (shipping costs a lot to Turkey) i got the kit, installed it, and the motor couldn't make the gun work, which is great, so i opened the gearbox again, (remember i couldn't fire the gun)

The part that holds the piston is snapped into two, i'm quite sure i can't do that myself, i'm gentle with screws and have carpal tunnel on both wrists, lol don't have that much power.
Also if you look at the ball bearing inside the piston (which came with the kit) the bloody thing doesn't fit there. It can't rotate freely when i put the last metal gear back. The plate gets the bearing stucked.
It would be my mistake if this happened with "parts" but this is a whole kit, and the bloody ball bearing won't even work in the kit's own piston.
Isn't this hilarious?
Also i heard the guarder kits usually cause this jamming thing, i will try to replace my cells, but unless i make a li-poly battery pack, it's not really possible to fit more cells to mp5a5.
I'm already considering getting rid of the whole kit.

[Auhydride]

I decided to epoxy it back, now it splitted into 6 pieces, i guess i got a deflected kit.

[Crunchmeister]

I would suspect that your battery just wasn't strong enough to pull that stiff spring. What's the rating on your battery?

As for the piston, that really sucks that it broke. I doubt epoxy will be able to hold that together.

[m102404]

Same thing happened (i.e. the collet that the the piston head screw goes through) to my buddy's piston as well...although his shattered, the piston head came off and then the piston smashed into it and cracked. Fortunate that the gears didn't strip.

I wondered if he had tightened it too much...but now maybe not.

Modify and deepfire pistons have worked for me so far...

Best of luck getting it running again.

[Auhydride]

It would hold it if it was just two pieces but there are 6 of them lol.
It's a 9.6v 2/3a NI-MH battery pack that i made, these are really nice cells made by GP, i think they can't discharge fast enough to pull the battery. I'm considering using a 11.6v li-poly pack and some expensive circuits to keep the voltage at 9.6v, but i can't afford it.
I ordered a sp100 spring because i was expecting something like this to happen, but wasn't expecting the piston to break this fast, i wonder if there are any good ebay or china shops that ship via EMS and have logical prices on items.

[Nova316]

Well it appears u don't need a new piston/piston head.. just replacing that piece.. I may have a metal one around here somewhere in my gunsmith box.
Any idea how expensive it is to ship a letter from here to turkey?

Also did u make sure your shimming was correct? 2/3a should be able to pull back an SP120

[Auhydride]

Yeah it's sad to hear people having issues with guarder kits, this is my first airsoft, and when something breaks i have to order from china since there are no local suppliers and customs are trouble.
What piston heads would you recommend? I'm planning to get those blue paddings the user Tirador sells, they sound promising. But have no idea what piston head to get.

[Auhydride]

Oh yeah, maybe just building the broken part would help.
Thanks nova, it would cost around 5$ to send a mail over here, but it takes near a month for it to reach, usual packages take 15 days to arrive, but they cost 20$ at least. Thank you though.
I'm not really sure how to shim, the gears don't blob much, and i can move them with my finger.

[Nova316]

Systema usually makes a nice one, I've had lots of success with a modify one tho.

The Sorbo (blue pad thing) Tirador sells is amazing for gearbox reliability since it prevents your gearbox from breaking even at high FPS. That goes onto the cylinder head not the piston head tho

[m102404]

Nah. The type of plastic that it's made of is "slippery" and most glues/epoxies won't stick to it. There are some types of cyano based glues what will hold...but not strong enough to take the impact/pounding that a piston will undergo. Something about UHMW/HMW plastics...

The guarder SP120 springs are nasty. They are extremely stiff and large. I'm loving the Modify s-series springs (s100, s110, s120). They are very consistent and "springy".

All my rifles have a systema silent head set installed. I've installed quite a few Modify polycarbonate piston heads (bearings).

To be honest...some of the best pistons that I've seen are the stock TM pistons...I hoard them whenever I can.

I'm not sold on the blue padding stuff...yet. I'll wait for a bit to see what comes of it.

[Auhydride]

Got it working again, with the stock piston, i think the batteries caused the cause so i replaced them, which is good because if they didn't cause that, the piston would come loose inside the cylinder and snap some parts inside the gearbox.
Also i'm going to get the sorbo stuff, Tirador is such a nice person

[Auhydride]

Wait a second.

http://www.uncompany.com/pageproduct...sp?prodid=6711

I ordered this kit, check the picture.
Why did i receive a red deflected piston head :/ There is no such thing in the picture.

[ILLusion]

That could've been an older product shot when Guarder did not have polycarbonate piston heads.

They probably realized that metal piston heads love to destroy version 2 mechboxes.