Source: http://www.ebairsoft.com/strong-plastic-ve...ear-p-2617.html

Given that V2 gearboxes have some stress points, I'd be very interested to see how the front of this holds up.

If they'd have made it out of polycarbonate like STAR/ARES do then it'd probably be pretty good and quite possibly even hold up better than pot metal shells, I suspect they've made it from the same rubbish ABS on the Galaxy MP5k and recycled condoms though so it probably won't be that strong.

Time will tell though, hopefully it will be stronger we'll have to wait for some victims to buy them to try

Im thinking this could be POM as its all the rage.

POM grenades
POM piston heads etc

I'm not so sure, POM usually has a different surface finish to that, that shell looks quite shiny and with a rougher finish which would lead me to think its probably ABS of some sort, never know though.

The finish of POM(Delrin)/CPA/ etc is only related to how it has been worked. Smooth and shiny is a result of casting the GB shell. The finish of the POM 40mm shells is due to them being turned from chunks of POM rod stock on a lathe.
The major reason for making parts out of POM is due to ease of tooling, and lower cost, compared to say 6061 Alu.
KM

I've had a number of POM moscarts (Pro-Arms) and they were not turned and machined, you could quite clearly see in the barrels where the injection molding machine had not forced enough plastic into the mold and had left open sections between barrels, along with rough finishing uncharacteristic with machining. Or it might just be they have machines made from cheese...

I suppose it'll be worth waiting for other retailers to get them and see if they say what the material is, if somewhere other than EbayBanned gets them i'll probably buy one to try out tbh though.

Well if they states that the GB will fix M150 spring, its quite stupid to make a weak GB...dont you think?.....pepole will find out;)

The problem is they've stated it'll take an M150 spring but said nothing else.

Most gearboxes could take an M150 spring, what really matters is how long it lasts for, its no good if it only lasts 50rnds is it, although the description would still be correct because it can take an M150.

If they'd done long term durability testing then i'm sure they'd have advertised the numbers (Ie, strong enough for 50,000rnds with an M150) as a selling point, somehow I suspect they haven't or they did and found it broke on the second shot.

Hmmm, nuts and botls to prevent stripped shells.... Whats the matal piece by the motor input for? Wonder what the weight on it is....

I'd expect its for the screws that fix the motor grip to the gearbox.

That's odd. I saw this a couple days ago, and it had said it was good for an M150 spring, then I thought a day later it changed to saying it was good for 150fps, but now it's back to the M150 spring description.

I might take the plunge with this and put it in my Dboys M4

Very interesting! Just don't really feel like being the guinea pig to try it it out.

if i can get hold of some better internal upgrades ill be a guinea pig

Have you ever seen a gearbox thats stated that it will take a surten amout of shoot before cracking...........NO.
Try it before crying about the "lack "of strength the GB.


.....I dont say that it is any good, but I think that you should try things out before assuming A or B.

I'd give it a month. Or with 500 FPS, one hour.

I bought one to make a cold weather AR. We'll see how it goes.

Less than 20 bucks? You get what you pay for...

How I'd wish for an Uzi gearbox to be made the same way. And while it "can" take 490fps springs (thats about an M130 I reckon), for how long?

Yes, but other gearboxes don't don't have statements of what springs they'll take either.

Saying something like a gearbox shell will take a certain spring or lower is completely pointless (And potentially very missleading) without at least saying how many shots they lasted for in testing, its a meaningless statement without that really.

I'm not 'crying' as you so put it about anything, especially not 'lack of strength', all I'm saying is that I suspect that without any figure for how many shots its taken in testing with said spring they've either not bothered doing any proper testing or they have and the amount of shots was very low and decided to keep it quiet. If they have done testing and found it to be a durable shell then I'd expect them to be banging on about how good it is, I mean, you'd have to be stupid not to if that was the case.

This needs a crash-test. Until that not much will trust POM.

If it is POM then for the price I would defo recommend it. The thing is that probably this is just regular ABS plastic of some kind and is not worth *suitcase*.

Bjorn

well seeming as no-ones gotten hold of one and the photos aren't the clearest, I'm gonna withold judgement till someone sticks their 500fps set up in and runs mags till it cracks. That'llbe a good test of if its any good.

Too bad it isnt a V3. I would get one for my G36 and slap a big spring into it. I may try one in my MP44, as that is the only weapon I have that has a V2 box.

I can see a metal cylinder head indenting the front of the gearbox severely with an M150. I'm not sure I'd want to run a metal cylinder head even with a lower rated spring in it.
Cool idea, but the only pro IMO is the cost so far.

I went ahead and ordered one and some nice 7mm bearings to go in it. I only plan to use an M110 in it, but we'll see how it holds up as it's going to go into an AEG that I use a lot. I post how the gearbox rebuild goes (tolerances, etc) as a follow up.

just tinking... if some in metal are ######, dont even think this will be a great upgrade... maybe a temporary solution, but not a final.

I love plastic. Good plastic can be stronger than metal... I just wish it was clear. For me, this is probably the one huge selling point of a plastic gearbox- being able to see inside so I can diagnose problems faster.

Which brings us to a question. Why isn't there a polycarbonate transparent V2 gearbox available? The Star/Ares ones hold up superbly.

I think a lot of people are skeptical of plastic, considering the negative association with 'plastic gearbox'. Remember the s**tstorm when people learned STAR gearboxes where going to be plastic? Well, most of those people still probably hate plastic gearboxes.

Hmm, Plastic GB = less weight? pro?

This might actually be good for the NBB Gearbox I am working on. Since my system has no impact for force transfer, the gearbox would only exist in the case to hold the system together.

hmmm... Definately helps with pricing then. I wonder if Ebairsoft does bulk order discounts for 50...