What version of gearbox

[BrokenBird]

I hear talk about gear box v2, v3, etc... Now how can I find out what gear box version my m4 has?

The model is ICS-23 C-15

Thanks

[m102404]

I'm 99.99% sure it's a standard ICS M4 mechbox.

The last 0.01% is that I've never handled that specific model.

The ICS M4 mechbox is a "split mechbox" design. The lower part (gears, motor, switch, trigger) are held in the lower receiver...the upper part has the cylinder & related parts, spring, etc.

Put the two together and you end up with a standard "Version 2" mechbox. The split design allows you to take just the upper mechbox out (takes about 15 sec) and drop in a different one (typically at a different power level....or to replace a stripped piston quickly at a game). With a "traditional" version 2...you've got to take the whole rifle apart, take the mechbox apart, swap the parts and reassemble the whole thing just to test (takes a lot of time in comparison).

Aside from one or two specific ICS parts...the mechbox can use standard V2 parts. Several version 3 parts are compatible with version 2. (Lots more info elsewhere on that...search around on here and other forums)

[Blackthorne]

Hard to tell without taking it apart.

One indicator is that there isn't a motor depth adjustment screw on V3 mechboxes.

[m102404]

Sure there is dude...perhaps you meant that it's not plainly visible?

On the AK it's under the screw that holds the grip on...there should be a tiny 1.5mm (might be 2mm?) allen key buried deep in there. Take out the grip screw and stick an allen key in to adjust. Same on the G36.

On the MP5K/FAL/(others where there's no motor cage), there's a set screw similar to the M4 grip

[Blackthorne]

Really? Kewl.

See? Even old timers can learn something new in the Newb Tank!