Well….
Considering the behemoth behaviour we saw….
Actually…range was the main thing OOTB , I was interested in…
Seeing if a V2.5, with a longer barrel, performed better than a standard v2.
By all accounts so far…not really.
So, it seems tweaking to unlock is required…
That’s one hefty beast!
For comparison I weighed my .308 scoped hunting rifle which came in at 3.5kg.
E&C Get 10 points for weight realism on that front
Fingers crossed for you that it proves as accurate as the one at Vipertac if you do get it souped up…
Be a shame if it isn’t… you know all too well that duplicating mods doesn’t always guarantee a duplicate result. 
Should be interesting at any rate. 
What.???
You mean medinchina quality is not reproducable.??
Tell me it ain’t so…!!
All you can do is try…I might see about trying to get in touch with the tech who did it, for some info about what was done and used…
Vipertac is still operating…
I’m curious as to what specs they said it had out ootb? Like fps and range they claimed it had if beemers disappointed with 330fps lol 
Upgrades would only have been the usual suspects, no doubt.
Six golden rules for accuracy… good airseal, good compression, good VE, good barrel stability, good gels, good hop up… and not overpowering beyond a gel’s in-flight capabilities. There ain’t much else and it ain’t rocket science or magic.
It might be a V2.5 but it’s the same shite, just a different bucket.
All the same should apply as to a V2 box, except there is more volume to push the gel down a longer barrel.
The main caveat is rps is limited more due to longer piston travel, and a sector having more teeth has less time between release and pickup so there will be a much harder limit on rps potential.
End of the day… A gel doing say 300fps at the muzzle is still going to travel the same distance regardless of what is sending it.
I suspect the background theory is this…
Higher fps…leads to more sideways fliers.
A longer barrel, with more time in the barrel ( with larger volume to push it)…
Leads to more time travelling straight…more correction time…more accuracy.
Higher fps doesn’t really push a gel that much further…its a good hopup that achieves that.
I suppose i had hoped for a bit more than standard v2 performance, out of the box… nothing i saw was terribly different from a well sorted V2… so far…
Higher FPS leading to wild trajectory has a lot to do with gel deformation in the barrel… exits out of shape, then reforms shape and goes in erratic directions.
Hop ups and harder gels tame that a fair bit, but we all know that once you get up in the stratosphere with FPS it’s a crapshoot.
To me the only benefit of a bigger cylinder is that it allows you to run much longer barrels and still maintain optimal VE. If you put a V2.5 into a carbine you’d be struggling… VE would be horrendous and a lot of that extra volume would be wasted once the gel leaves the barrel. You’d have to port the cylinder then you lose the volume anyway… can’t fight physics.
But as @BME said, as a donor box into some of the long boys like a ZB26, M60, even an M14 EBR that bigger cylinder shows promise. Hopefully those boxes will become available as a seperate item.
Interesting reading 
Cyber Trigger do sell the V2.5 gearbox as a standalone item. I cant link it at the moment because my workplace’ web filter thinks Cyber Trigger sells “firearms”… oh boy…
Maybe I’m being a bit harsh…
The initial exposure, to the worked one, was “WOW”.!
Range, and accuracy.!!
Currently, this is just above a standard v2.
It will get souped up…and hopefully be of similar performance to the first one I saw.
I’m not “Dissapointed”….just “impatient.!”
And yeah, I’ve seen the link…$300 gearbox.!
There isnt much in gel atm that a v2.5 would fit into without massive modifications…
The cheap SR25 KAC thingy taccy toys had would be a great candidate for a v2.5, has the space they just cheaped out on a nylon v2 box.
The A&K gearboxes are inline LMG boxes, still only have 16 teeth which is fine in airsoft with the smaller projectiles and barrels, gel suffers though.
M14 geaboxes are also a weird not quite inline box, with 16 teeth, same volume issues for gel.
In airsoft, due to less need for volume they quite often change them to standard v2s, as there are more choice of quality parts that will reliably handle DMR power.
The main benefit for us gel ballers here, is ability to use the extra volume effectively with a longer barrel than we are used to.
Getting decent range and accuracy with higher fps is a challenge… well quite a few challenges really. Gel itself being the ultimate one!
I have been testing the new LDX advanced box… harshly. It has seen close to 450fps, and can tell you I can see some gels going wild a just a couple of meters! But, only a 320mm barrel with that fps was never going to be ideal, was more just for a giggle. Also while hopup was installed, it has not been tuned at all.
You also need more barrel with bigger springs compared to what you might use with an m90-100 as the gel accellerates faster it also covers the barrel length faster… bit of a phenomenon with higher fps and 0.2g projectiles. Airsoft would just use a heavier ball to adjust, but again, gel, stuck with gel and 0.2g!
There may be a video soon on the MP5-SD6 shenanigans… 
Yeah that is the “Ultraline” gearbox… remember the eshooter mosfet from your CYMA M4… they have that, full metal rack piston (I think the v2.5 have metal rack piston anyway, but the v2s have only one metal tooth), alloy piston head and cylinder head, stainless cylinder instead of brass, and are painted black. Otherwise very little to no difference to the stock ones.
I think there might be a bit too much hype over V2.5 boxes and maybe unrealistic expectations.
Great for the long boys, but as you say, a gel travelling at 300+ out of a short barrelled V2 with optimal VE is going to behave the same if it’s coming out of a long barrelled V2.5 with optimal VE travelling at the same FPS anyway.
Paper aeroplane syndrome. Flinging something of limited mass at a higher FPS doesn’t necessarily equate to longer range… or greater accuracy. Gels lack mass so lack impetus. Heavier gels would help, although range variations with BBs generally show a decrease in range as the weight goes up… stands to reason. Finding the seeet spot is key.
That said, there’s no denying the HK417 demonstrated at Vipertac did have a considerable range increase over a standard M4. Maybe it was just a freak build with perfect setup, who knows?
to be honest, thats what sold me…
and curiosity, about these gearboxes.
No-one else has appeared to buy one, and give it the going over, on here…
i seem to remember the tech saying he put in a LOT of time, to get it right…
Shoulda grabbed it…!!
This 100%
I would bet my 380fps blaster on it gets the same sort of range as the long v2.5 based blaster doing 380fps… cant change physics!
It reminds me of an argument I had at a field once (well he thought it was an argument, I was just explaining why I was right!)
HPA hurts more and goes further than an AEG at the same fps.
Bullshit. Complete. Utter bullshit.
End of. Same gel, same velocity… and you are telling me that HPA magically defies the laws of physics? Newton would be pissed!
The real challenges for high fps accuracy lies in gels, and barrel stabilisation and finding a hopup that suits it AND the style/look you can live with.
I remember with my custom dissipator going through several hopups to find one that would tame it at 380fps. Then dropped it to 370fps to keep things staying a little straighter and allowing the hopup to work more consistently.
What he said 
Absolutely.
Kind of had half an idea to slap a V2.5 in my M16 with 500mm IB.
But what am I going to gain? I’m already at 320fps consistently with a 1.18mm AG spring.
I guess it could be something to play around with if I get bored.
Looky what I found
V3 gearbox
V3 comes in purple or silver
And heres an alternative v2.5 gearbox (I believe)
You can get the v2.5 in black and oil slick colours, oil slick is right up there in price tho
Not sure about the legitimacy of these, but there you are
I believe they are their different versions of a V2 gearbox. Bloody misleading. 