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Complete Electric Blowback Gearbox Upper for ICS M4 Airsoft AEGs

5 Customer Reviews

by Jonathan L. on 12/30/2018
"A direct drop-in for my CXP UK1 Captain. I use this to switch to a M110 spring for CQB. Sure, the system already has a quick-change spring function. But for a few bucks more, I get the full upper gearbox assembly and don't need to use tools to swap.
by Curtis W. on 07/24/2018
"Fits perfectly, works gear. I got an extra for my ICS MARS Komodo so I could quick swap uppers at fields that have different FPS/Joules limits. This upper was shooting 440 out of the box, I lowered it to sub 400.
by RANDY B. on 04/25/2018
"Works as described. The quick spring guide is great. Makes swapping springs to fit the different field limits easy.
by Alex F. on 09/15/2017
"Works exactly like it's supposed to and even has the easy spring changing unlike the stock gearbox.
by Madison M. on 06/15/2022
"Got one for my CXP MARS II. I think the reciever spec is a bit different as this upper gearbox just barely fits. I think the rear takedown pin is slightly in a different position as try as I might it doesn't like up perfectly. I was able to get the pin through but it takes quite a bit of finesse. To the point where you are concerned you won't get the pin back out.

That said, it is great to have a drop in upper gearbox that I can spec differently than the stock one (MARS II stock is better for outdoor play than most well upgraded guns).

The following parts were used:

Master Mods ICS air nozzle
Retro arms tappet plate
Lonex Type 2 Cylinder
Lonex Blue Cylinder head (without the gasket on the front of it, i.e. not the ultimate version)
Lonex Pom Piston Head
Lonex Red Piston (to disable the ebb)
Systema M100

Installed with the MARS II stock lower, a Maxx MI Pro, Maple 70*, and a 370mm 6.03 angel Custom barrel, all produces 345 -2 fps with KCS Perfect 0.25g bbs. With KCS 0.28gs it came to 331 -1 fps (abnormally consistent).

Range measured with a golf competition range finder was 175 feet comfortably (7x7 inch target hit every time), 190 feet with a lot of dispersion (still man sized target hit).