New Echo1 MP5

[AZsharpshooter]

I thought that this was a pretty neat item that I found on ASGI
http://www.airsoftgi.com/product_info.php?products_id=4480
They give you two different gearbox's and lower recivers one gear box is set up to shoot at 400FPS and the other at 350FPS. Ive never seen any other company do this.

[david23717]

i think ics does it, but not with two boxes all you do is change the spring,its a quick change, you take the stock off, and there is the place to change it. much better than paying for 2 boxes

[clayton]

its much more than the spring, your gears could screw up if your spring is too hard to handle.

[joebo]

how hard is it to change the gearbox?

[blitz]

depends on the gun, those "master series" guns are very easy, you just pop out a few screws and the stock, then pull out the bottom receiver and replace which the other one thats included, and the ICS M4 series act like the systema PTW's, with the clyinder/spring assembly able to detached so easily and replaced. as for the bottom half of the ICS mechbox, as far as i know the gears and parts are high enough quality and strength to run an 120 spring. Saying that because i used to own one, i also ran mine on a 11.1 lipo stock without any problems

[AZsharpshooter]

I guess the A&K M249 has a quick spring change feature that is really simple.

[blitz]

same as the echo 1's, its just a latch that releases the spring guide

[KileyHAZ]

same as the echo 1's, its just a latch that releases the spring guide

STAR and CA M249s are the same, its a really handy feature, looking forward to tinkering with the new ICS L85 that is setup the same way!

[IconarmsDealer]

I have aCa M249...what rate of spring do you think I could get away with, without changing anything else?

[KileyHAZ]

I have aCa M249...what rate of spring do you think I could get away with, without changing anything else?

Depends what battery you have in it. If your running a mini 8.4 then 110 would probably be max. If your running a large type 8.4 or a mini 9.6 you could get a 120 in there I would wager. The bearings are rest of the internals are pretty stout so you should only have to worry about your power options for anything below 120/130.