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ICS Upper GearBox F. Features / Application
A main feature of an ICS M4 is it's two piece gearbox. The upper gearbox can be slided out and replaced in the middle of battler within a minute or two. -Having an extra gearbox is almost like having a spare gun. Piston, Piston head and tappet plate are consider wear and tear parts that requires replacements every once a while. When somethings goes out in the middle of training session, most of the time the A.E.G. will need to be put away because repair will take about a hour with the parts available. With ICS series M4, you can carry a spare gearbox and simply swap it out in the middle of the game and be ready to go.) -A lot of players play indoor and outdoor. With a spare gearbox, you can basically meet the velocity requirement for both in minutes. (Have a M100 spring in one for indoor and have a M120 spring in another gearbox for outdoor gaming!)
Complete tune up kit includes:
-ICS M4 Metal Upper Gearbox with screws -ICS Aluminum full teeth full metal piston -ICS Version 2 reinforced nozzle -ICS MC-02 Tappet plate for ICS M4 -ICS Version 2 Ball bearing spring guide with screw. -Reinforced Aluminum Piston head with ball bearing -Reinforced Aluminum Cylinder head. -Reinforced cylinder Special upper gear box package will increase the convenience of upgrading FPS in every game.
(Write a review)
"I have only 2 gripes about this kit: The ICS aluminum piston is a gear shredder. Toss it, or sell it to someone building a semi-only DMR. Second, WHY would you put a bore-up cylinder on this that is ported?? If you plan on using this with a barrel longer than 420mm(probably more like 380....those are some big holes) buy a FULL CAPACITY BORE-UP cylinder.
Note, you will need to have high torque gears. it doesn't advertise the FPS on this kit, but with .25s it was shooting 420 out of a stock 363mm barrel. The main thing that prompted me to swap out the piston was that it was completely stripped.
I replaced the piston with a G&G Reinforced, and swapped out the cylinder for a Systema full capacity bore-up, and dropped in a 110 spring to allow it to comply with local FPS rules(and even then it had to break in a little before it was under 400), and its not running great.
EXCELLENT compression. Even with a 110 this thing was pushing 410 fps(broke in to just under 400)
Except for the piston, quality parts
Bore-up piston head and cylinder head, ideal for longer barrel set-ups
Piston is garbage for full auto users
Spring included puts it over most full auto FPS rules, and under standard DMR performance.
Cylinder included is probably not the best choice, as bore-ups are more for longer barrels.
"I was VERY disappointed in this gearbox. The frame itself was in poor shape with multiple visible deformities. The holes made for the screws were poorly drilled and overall I was just very mad that I paid $85 for such a piece of junk... I also think the spring might be higher than an M120.
Because of the deformities it didn't even work in my ICS, and the screws are stuck in the poorly drilled holes. I don't blame evike for this since they only sold the gearbox, but this is a warning for anyone who's looking to buy one of these.... I either got lemon or ICS is doing a poor job these days on their upgrade gearboxes.
"insted of useing a 1 part gearbox can you somehow put this on a M4 other than ICS?
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