Ball bearing rolling inside gearbox?!?

SlappyTheSeal wrote: »

Hi I just looked at my Combat machine m4 carbine today and noticed when I tilt it up and down that there seems to be something thats freely moving around inside my gearbox. It sounds like metal ball rolling around on metal. Its firing normally and I'm pretty sure it isnt a BB so what do I do? I think its called a ball bearing that may be loose but I'm clueless really, when i point my gun up i hear it moving and then when i point my gun down it rolls down again. Please help thanks!

how long has it been in there? you can take the pistol grip off, take the motor out and see if it will fall out of the bottom of the GB. You should really try to get it out though, it may not be doing anything right now but it only needs to get into the teeth of the gears and it will do a lot of damage. Having said that, depending how long you've noticed this i don't think it's in your GB, if it was the chances of it doing some damage are pretty high really so it may be somewhere else. can you take a gearbox apart?

SlappyTheSeal wrote: »

I'm no good with gearboxes but ill try get it out of the motor hole ina few minutes

let me know how it goes, otherwise bring it to a retailer and see if they can get it out. if you're ever in Kildare i can otherwise have a look but it's best to take it out before you game again.

SlappyTheSeal wrote: »

Nope didnt come out. Looks like ill be bringing it to a repair shop then

yeah best to get it open to have a look.

SlappyTheSeal wrote: »

Turns out it was a loose shim, never opened the gearbox before yesterday so Im not sure how it got there, although I'm going to have a rant about mia in a few minutes about my gun. Turns out because they never downgraded the spring (m120) and just drilled a hole in the side, my gearbox cracked in half Now I'm stuck with an unusable gun

Welcome to airsoft, where MIA drill holes in cylinders. And people rant bout "it is a very efficient way of downgrading" give me a break like.

Bring it back to them, they sold you a damaged gun. You should not have to foot the bill for their wrong doings. If your car could drive too fast would you drill a hole in the engine block?

SlappyTheSeal wrote: »

I would but its been 3 years since i bought the thing, iv only gotten comfortable with taking out gearboxes very recently, so i think they would just laugh me out of the shop. But i agree 100% if i had of bought it last month id be protesting outside their shop for the next year or until they gave me an undrilled gun.

If its 3 years old your gonna have some problems with getting a refund!! But the old versions of the g&g combat machines were supposedly rock solid and people had them without issue for far longer than 3 years. The newer versions may not be as good but they're still a solid piece. You could've had that gun for a year or 2 extra if the spring had been replaced instead of a drilled hole
As you said yourself don't use it even if it's just a hairline crack because if the crack does break over all the stress then your gears might sh!t themselves while moving in which case you'd most likely be looking a new gearbox bar a few bits.