Reinforced Gearboxes

[Falcon7]

So I'm upgrading to a M140 spring and I want to know whether or not I need to get a reinforced gearbox. Is a stock one going to break? Are they any thicker than a normal gearbox? I want to make sure it will fit inside my gun.
I'm looking for other DMR related upgrades as well, so if anyone would like to recommend a certain barrel or other part that would be great.

[Beran]

which stock gearbox? stock echo1 is not the same as stock KWA.

[Falcon7]

It's JG, possibly. Not sure. Assume low-medium quality.

[Beran]

version 2? is it an M4/M16?

[Falcon7]

Version 2, Sr-25.

[Beran]

finding a reinforced shell for an SR25 might be tough. harder than the standard V2/V3 anyways.

honestly, i would use a lighter spring and work on your compression. if you are going for 400fps, an M100 or M110 can get you there with good compression. cramming a huge high powered spring in your gun is going to shorten the life no matter what parts you put in, and you are going to have to replace a lot of JG parts to make it last more than a thousand shots.

for a true DMR, power isn't really as important as accuracy. a tightbore barrel and bucking/nub combo are going to be a much better upgrade than just power. all the power in the world doesn't do shit if you cant hit your target.

[Falcon7]

It's a standard gearbox, not an SR-25 one. I'm going for 450+ fps. I'm also looking for a 509mm TBB, but I haven't decided whether to get a 6.01 or 6.03. I have a great motor and gears, so that shouldn't be much of a problem for now. I'm going to get an H-nub and hard bucking.

[league 4]

So you have a G&G SR25?

[Falcon7]

No. I have a JG SR-25. G&G SR-25s have longer gearboxes, air nozzles, pistons and possibly some other internal differences. And from what I've heard they have way too many problems for me to blow $400 on one.

[shakespeare]

an M140 spring will rape a stock JG gearbox.
In addition, it would get you up towards 450 feet per second, which would ban the rifle from most fields.

[shakespeare]

Doooooouble POOOOOOOOOOOOST!!!!!

[Falcon7]

I'm making it semi-auto, so I can take it some places. Probably going to save up for a scar or a masada after this anyway, so I can use that where I can't take my DMR. I'm also pretty sure that my gun is not stock. Lots of stuff was messed with internally when I got it and the parts are actually good.

[Beran]

"pretty sure" is what blows up gearboxes. you don't know what the previous owner did inside that thing, maybe he lost a bearing and substituted a lower quality one. that one bearing going out has the potential to pretty much grenade almost everything in there under that kind of load. not saying that's going to happen, but its a worst case from a "pretty sure" standpoint.

also it being a standard V2 gearbox shell, i would absolutely replace the shell with something reinforced. especially if you are wanting that kind of power.

i only know of a couple of games with 400+ fps DMR rules being run in the past, if it were me i don't think i would build my only gun as a 450+ DM rifle. id suggest maybe keeping it at a more manageable 400 until you get your backup gun and then push it up from there. then you can get used to how it shoots by using it more often, and when you can move it up to a higher velocity you will already be familiar with how it shoots at range.

[SLINKEY]

if it truly takes a version 2 gear box i would reccomend a classic army, or a kwa gear box, there both pretty reinforced. But i dont think theres many version 2's out there that will last long on a 140 spring, with out some kind on dampener on the piston head or cilinder head.

And if it has metal bushings it has been messed with, i dont see why anyone would upgrade anything and leave the Normal Jg nylon bushings in there.
i dont think i'v ever open'd a jg with metal bushings in it...

But a 110 should put u at 400 fps with good compression, 120 for like 420's 130 for 450's and 140 for 500's or more. is kinda what most guns work out to with a modify "M" spring

I have seen kwa sr 10's and 12's get 500 out of a 130, and a few other guns with Insane compression tho..

You should be able to get really good range with a good hop up and barrel combo, and not have to stress your gear box.. all of my dmrs hit like 420's and out shoot a few guns that shoot 500.. because some people think fps makes range.. hop up and bb' selection will get u farther then fps when it comes to range, .. well thats what i'v allways thought..

[Jewish Ninja]

i only know of a couple of games with 400+ fps DMR rules being run in the past, if it were me i don't think i would build my only gun as a 450+ DM rifle. id suggest maybe keeping it at a more manageable 400 until you get your backup gun and then push it up from there. then you can get used to how it shoots by using it more often, and when you can move it up to a higher velocity you will already be familiar with how it shoots at range.

This. If your SR-25 is your only gun, I'd keep it legal for field use until you have something else. Theres no point in building a 450 FPS DMR that you can only use at games that have that rule in place. This is even more true if its your only gun that you own.