Catastrophic Issue
 

Has anyone ever just had the end of their mechbox blow-off? I have a TM Ver.3. Today I was firing off some rounds in semi and BANG! the part rips across the area and lands on the floor. I only have a SP90 spring in it, I was under the impression that the Version 3 mechbox was stronger and more reliable.... OOPS! Here are some pics.

http://www.pbase.com/shadowmatter/inbox

So yeah, if someone is going to be at the Black Bear game on Sunday and knows how to swap out all the internals in a gearbox shoot me an e-mail or PM, that would be great. In the mean time I have a new gearbox shell, and spring guide arriving on Thursday.
BTW, on that note; are there any rentals available for the Black Bear game?

If there are any Gun Docs or Self-proclaimed DIY'ers in or around Oakville please let me know. If nothing is available I'll just do it myself, happy thoughts! :roll:

Ouch. First busted V3 box that I've heard of now.

Where pics?

Wow, that's a new kind of failure. Not even an impact fatigue failure, the spring guide doesn't get suddenly loaded. I'd guess that your arrangement is bottoming the spring out so the piston repetitively jams on the spring guide. You can see a break in the spring guide crossbar.

So then the spring isn't long enough to seat properlyin the cylinder? It's a Guarder sp90, I was under the assumption that medium upgrade springs were a universal fit.

I don't know for sure, I'm just throwing a guess. You really need to take the box apart and do some diagnostics.

I wonder if it could just be from wear and tear. Since I did the upgrades I've put about 10,000 rounds through it, and regreased everything once after the upgrades. I really doubt that this is the first ver.3 gearbox to lose the ass end.

oh man, that break is awesome!

What piston head are you using? Stock Marui?

I'm not sure I've ever seen a mechbox loose it's ass end. I've been drunk off my ass, but my ass has never been drunk off. Never will either.

what? you forgot about that night with the bottle of tequila and 3 midgets?

You're right! I think they busted a mechbox the very same way. I got a bottle of tequila for swapping out the parts back when I did mechbox repair.

Lol. Good save...

back on topic, reason why I ask about the piston head, is because the stock Marui piston head uses that thicker nut. Some spring combinations don't like the Marui nut combined with a bearing spring guide. It will lead to the kind of failure that MadMax described, regarding the spring bottoming out. However, typically, when this is the case, just some piston teeth get stripped...

on the picture... did you try to glue it?!? hahaha!


anyhow, my TM ver3 also got busted. but in the other end...


excessive dry firing is cause..

Don't think dry firing can do that much damage...

From all the working models of guns I can't see dryfiring being any more harmful then with ammo. It still cycles the same way.

However shooting a gun is slightly harmful to the gun. But it was meant to be shot so its only considered wear and tear.

Reputable gun pros if i am wrong please enlighten me on this.



As for the mechbox funny brake. It may have been just a bad mechbox.