ROF stuff
 

Ok... i'm removing two teeth from my sector gear and removing the second tooth from my piston and i'm going to run a 9.6v or a 10.8v battery.

Question is what spring would be best? I dont wanna get one to powerfull because it will decrease the ROF. But i dont want one to weak because i'll mess up my piston teeth if it doesnt return fast enough.

Anyone have experience on this?

Never heard of it. Sounds like the fastest way to label your AEG as "FUC'T", but I could be wrong.

Yes its a possibility... but we'll see what happens... i'm a gun dealer so i can get guns for $60USD and i can get new motors for only $25USD... so i'm not to worried about it.

Ok, go for it and let us know how it goes, I doubt anyone around here has heard of such a thing before, and if it works well you'd be the first to educate us on it. Best of luck!

Low rated spring. Stock spring, M85, M90 and M100. Heard of this before. FPS will drop but insane ROF. Ask players from filairsoft.com for more details.

see thats what i was thinking too... but i remember somone saying use a high rated spring so that it returns to neutral faster so you dont risk tearing up the teeth on the piston.

From what I remember. Its not for high rated spring. Piston and gear will wear out fast. So it is suggested for low rated spring. If you are really into ROF why not just upgrade to higher voltage battery. 10.8v or li-po 11.1v.

I am upgrading my battery on top of these mods....

It's actually a pretty popular technique in Asia for their insanity-ROF guns. There are certain limitations you can push a gearboxes ROF before you start murdering the teeth. The solution is a short barrel (to allow a cylinder that's ported), removing final teeth on the sector gear, and possibly removing piston teeth (as required.) The result is a shortened piston-stroke. Less movement required = higher ROF. Pretty simple concept.

When you do this, consider the length of your inner barrel and where your cylinder port is. You may be able to remove more teeth off your sector gear. Or you may already be removing too much. Find out where your port is, where the piston head will be when compression begins, and which teeth are still connected between the piston and sector gear at this point. The teeth beyond this release point can be safely removed.

Yes, using a heavier spring will return the piston to battery faster - in normal guns. But when you begin to reduce the piston stroke, that can make up for issues of raking teeth. To be honest, I *think* you may be able to get away with a stock, M80 or M90 spring with such a setup. I'm not 100% certain as I don't have any hands-on experience, I only know the theory.

Easiest way to find out is to just pick the FPS you want, set it up and see if that ROF is acceptable to you. If it's not, reduce the spring tension till you find the velocity you like, run it for a couple thousand rounds and then check the piston teeth for any excessive wear. Biggest signs are the first three connecting teeth of the piston. (negate the 2nd one in your case since you're removing it.)

I'd actually recommend keeping the 2nd tooth intact. If you see it getting chewed up, then your ROF is too high for the spring. See if you're able to shorten the stroke more, and if not, then you should upgrade the spring rather than remove that 2nd tooth.

well i just finished doing the mod... took me all of 20 minutes.
Its fast... but not as fast as i'd like it to be... 10.8v battery here we come!!

BTW... this gun has NO modification other than me taking off the second tooth from the piston and two teeth from the sector gear.

I'll take some vid tomorow

i just got it to fire so fast the mag couldnt keep up... hmm

What kind of mag are you using?

The fastest feeding magazines are Marui lowcaps and Magpul lowcaps.

i'm using a star 90rnd midcap

also i forgot to mention this is an MP5

But i'm thinking it could be somthing else because the BB's just kinda start spitting out and only flying about 5 feet....

Is the rest of this gun completely stock? And what brand is this mp5?

Does it shoot okay in semi-auto? Or does it shoot 5ft only in full auto?

yes the rest is completely stock... its a WELL MP5. And it shoots ok when its on semi.