This past Sunday I went out to an even with Birdman to test out the new G3. The first 2 matches, I would use my 20 rounders and pick my shots, picking some people off as they came along. After that, all i did was use my hi-cap. I now know that this gun needs to be some type of support gun. The ROF is amazing but and i dont have the patience to play the sniper role.

I know that im going to need high resistance or just better gears so that they dont completely strip when i get my box mag and im laying on the trigger. Please post any type of internal part that I would need to make this gun a true LMG. Right now im only worried about getting it to survive the constant firing. Later ill worry about getting it shooting hard and fast...

EDIT: If I just bought a high speed Systema set with an m120, that should do the job right??

You'll need to modify the reciever to make it even look like an LMG. Don't expect to be able to take your hicaps/drum mags to milsim games because you like to play support.

I say get a bunch of standards and get comfortable with your gun. Everyone lays on the trigger in the beginning.

I think I have decided with what I will do with my gun. I dont really care what it looks like. If I can lay down fire and keep guys from lifting there heads up Im pretty sure that Ill be giving some support to the people moving in. And i specifically asked people to post about what will help my gun run like this, not more of what it will look like. That Ill worry about later...

they make a beta mag for the G3, good thing you want to upgrade your internals because you don't want to look like method with a broken gun because you held down the trigger until it broke.

L337, hes already made his mind up, its what he wants to do

I should of posted earlier that I really dont care if it looks like a LMG. Right now I have it shooting at a CRAZY ROF. If I can get a little more range, get it up to 400 fps, and have enough BB's to blast everywhere Ill be happy. Hell, itll be a SAW just not an m249 or 60 when im done with it.

I can tell he made up his mind, and I suggested that he either

A. made his gun LOOK like an LMG for milsim purposes, and
B. that he instead just plays it as an assault rifle.

The reason for these points is because if you come to a milsim game, you won't be able to use your assult rifle as a SAW, and will be out of luck if you don't have anything besides hicaps.

Matt, best I can give from just listening to everyone lately is look into systema internals, and throw a spring in. Obviously I'm not as educated as most other players, but there's my $.02

Good luck mate!

sureshot. i think this is a great idea. i would love to see the final product shoot. my advice is, why don't you call airsoft atlanta and ask them what you would have to do. all my questions that i ever had about upgrades and etc went through them and they have always been a great help.

Haha, I cant wait to see it either. Externally, the main things that you will see will be the box/drum/c-mag and some type of badass looking red-dot. The scope I have on right now is from another gun so Im not losing any money for not using that. Internally, Im looking into the Systema sets including gears, piston and pretty much everything ill need to make it run...

Actually, this could be the start of a custom-job.

There is in fact an LMG version of the G3, it's called the HK21, but it was made to take both belts and mags. A mag-only variant is called the HK11. I haven't found a picture of it yet, but there was an 80-round double-drum made for the HK21/HK11, so a C-Mag wouldn't be out of the question.

As far as parts go, I've been told by Atomic that standard G&G gears are better for high-RoF setups than the actual Systema high-speed gearset (say what you will about G&G guns, but their parts are excellent).

ooh suggestions!!! lol naw but i actually thought about it this time...

the vers 2 gearbox i'm building looks like this:

guarder polycarb piston
ball bearing spring guide/piston head
pdi 170
classic army helical high speed gear set
and a 9.6 3300 hundred mah battery

you're gun already has and extrmemly high ROF so you may not need to go so in depth...

this is what i'm already having the guys at kastway build for me..so hopefully we can see how it turns out and i can help you decide what you really need and what you can spare

(Shaking and rocking back and forth) ... you guys sound like me two years ago. I tried so many things with my gearboxes trying to improve FPS and everything, but that only gave me a lot of frustration and a bunch of broken parts. I bet someone could build a gearbox to shoot very fast without it breaking for a long time, but I don't think I had that knowledge and I doubt you guys will have much luck either. Do it if you want, but I'm telling you that it didn't work out for me and airsoft guns have a hard enough time staying alive with stock internals or even just one upgrade.

Im not worried about giving it a better ROF or making it shoot faster. What I want right now are things that will allow me to shoot at this constant ROF for a while if I need to. I dont really care about shooting is any faster. So right now im just building up things for my gearbox that will allow me to do this.

well then what you need is a reinforced gearbox and a polycarb piston, ball bearing piston head/spring guide to reduce impact with the cylinder head and keep the spring from binding... just some suggestions

axis. no more suggestions please. if your going to be firing alot you should upgrade to a full metal piston. ask anybody who has had to replace their pistons cuz they fire to much (cough cough method). rate of fire may go down a bb or 2, but you wont have to replace the piston. matt has said it over and over, he just wants to be able to lay down fire for long periods of time if need be.

I've read that a metal piston would do even more damage to the gearbox. A titanium toothed piston might be the better choice if you want durability.

But birdman is right, let's try and follow rule #1 here (speak from experience). It seems like a lot of people on the forum now are just relaying information that they have heard from other websites and that is not only annoying, but it's not always accurate either. Even if you notice me doing it, point it out (in a friendly way). I'll probably come back and argue why my response was okay, but at least you tried to enforce rule #1, right...

I looked into what the HK21 looked like and I like it but I would have no idea where to get that hand grip.

There are a couple things you need to consider about swapping the piston.

A full metal piston has more mass than a polycarb one. That means there is more mass hitting the front of the gearbox, and can increase the chances of the gearbox cracking.

And if you get titanium tooth piston (only one I know of is Deepfire, and it's titanium-coated, not solid titanium), if something jams in the gearbox, the likelyhood of the gears breaking goes up (metal on metal).

So I'd say just stick with a polycarb piston. It's cheaper to replace a piston than a new gearset, plus new gears might require reshimming.

As far as the handguard, you could try what AEX did for their AE MAX LMG-21, use a RIS:

www.airsoftextreme.com...ts_id=2314

i'm not suggesting anything but on the topic of pistons,

www.airsoftmechanics.com

(previously provided by philapean) has great info and VERY extensive reviews on both metal and polycarb pistons.