Making my G36 into a squad gun
 

The internals are stock currently and I have only two stipulations for how the gun must work.
1. Have a bit more power so it can shoot through brush easier.
2. Have a decent rate of fire; doesn't need to be completely insane but a bit faster than normal.
I have all the body pieces that I need, it is just a matter of getting the right internals. What do you guys recommend?

myself I would do a slight spring upgrade, metal bushings, metal spring guide, that would get your FPS up and then I would add Hi-speed gears and a 9.6 or 10.8v battery. But you can't go to heavy on the spring or you will lose the ability to be high speed.

Is the V3 GB designed for sustained fire? I get nervous doing 15-20 round bursts on my G36 :p

With a drum mag, my CA G36 is essentially a MG36. Internally I installed a new spring, spring guide, piston and piston head (the latter two because CA guns chew that thing up quickly). You don't wnat your ROF to be too high, as it is if you get a drum mag it'll have a hard time keeping up even with a stock gun.

My STAR C Mag doesn't feed my MG36 fast enough and on a warm day causes it to dry fire once every 5-7 shots. On cold days it can be once every 3.

kalnaren you can run the G36 for longer periods of fire although it's not as "realistic". ;)

my friend put systema internals (with standard gear set), a bipod foregrip and a G&P stock on his G36. with nothing more than a large battery it was shooting around 1200-1300 rounds per minute at 330fps. Lasted over 40,000 rounds, he just sold it and it was still working fine.

where can i find this highspeed version 3 gearbox

you may want to look into a mosfet switch. it will increase your motors durability and ROF. I would worry about a high rate of fire unless you don't mind breaking your gun. I would stick with an 8.4v, upgrades can be done more than one way. If you use small batteries, adding a couple capacitors will buffer your power source and give your motor a more consistent power.
read more here, http://www.airsoftmechanics.com/articles.php?aid=11 and here, http://www.airsoftmechanics.com/guides.php?aid=14

Speaking of the electronics behind it, I recommend you upgrade to deans connectors. I put 2 sets in my G36K and it's almost like adding another cell to your battery.

Metal bushing
170% spring
bearing spring guide
9.6v(3000mah or higher) large battery

You can add all those fancy internals(high speed gears, bearing bushing, silent piston head, mosfet switch and so on) but this is really all you need. In my opinion the rest is just a waste of money.

I was just about to say that! I added a Deans ultra plug to my MP5K 2 days ago, and almost.. Well... How you say Creamed my pants. The plug even looks sexier than the large tamiya style one.

Personal opinion: The MG36 is not a real LMG, its just a G36 with drum mag and bipod, its as much a LMG as an M16 is if you stick a drum mag and bipod on it.

Fact: Some fields will not accept an MG36 as a LMG so its still limited to 300 round loadouts.

Also as far as I know the MG36 was scrapped and isn't used by any armies out there, though because anyone can strap a drum mag onto a plain old G36 assault rifle (read: NOT LMG) and call it an MG36 I guess they can exist.

I don't think anyone makes premade ver.3 turbo mechboxes. You can however buy highspeed gears (Prometheus, Hurricane, Systema, etc.) and a Systema turbo motor which will give you a quite high rate of fire with a large battery (this combination with a 9.6V 3000+ mAh battery will cause misfeeds like mad.)

More stock parts = more reliable gun. Also I've seen PDI springs screw up FAR more than all other manufacturers combined. If you want ~400fps in a short barreled gun (G36c, M4A1, etc.) get a Prometheus M120. If you want ~400fps in a long barreled gun (M16, G36, etc.) get a Prometheus M110 and a tightbore. I only have an M110 and a 510mm 6.04mm tightbore in my CA36 (and bearing spring guide, and stock TM piston/piston head) and its shooting 389-391fps with KSC 0.20's.

The only similarity to the m16 is the ammo used. You would find yourself with an over-heated, dirty jammed up weapon if you tried to use the M16 in a support/machine gun role.

Meh to each their own I guess. When I play a mil sim because of ammo restrictions I run it as an assault rifle but if it's just a regular skirmish I'll use it as a support weapon. Perhaps I play too much videogames but I loved the MG36 in BF2 and that's what I modeled the gun after.

I'd just like to point at that MG36's also had heavier barrels installed for sustained fire although i dont think they could be swapped out quickly.
As for it being scrapped, i've got no info on that. It falls under the assault rifle class more than an LMG, due to its inability to swap out barrels and lack of belt feed. But I think it was just a lighter alternative to carrying around an 8kg LMG. Due to the G36's natural high accuracy it makes a poor substitue for a suppression weapon, though I've seen G36K variants with bipods and C-mags

I personnaly have owned and fielded a TM G36C for almost 1.5 years. I changed the front end for the bigger one and work with 9.6v 3000mah batteries. Before I changed more parts all I had was Systema metal bhushings and a Systema M100 spring. The ROF was more than OK and it was reliable. Since then I changed the inner barrel for a M4 lenght Systema 6.04 (with a silencer) and changed the spring (prometheus), spring guide (prometheus), a Systema silent head set and everything else is stock. Keep in mind that the stock gears of a V.3 gearbox are very sturdy. However if you want more ROF than you have to change them and the motor like previously mentionned. I would go in steps so you can judge as you go. That could avoid spending too much cash for maybe nothing...

My 2 cents!! ;)