30rd M4 Mag dimensions?

[flaagan]

I'm working on a small project for some fellow airsoft players, and I'm trying to find the dimensions (or preferably a cad file / drawing) of 'standard' 30rd M4 magazine. I'd rather work of actual specs than try and eyeball it with a set of calipers. Any suggestions on where I could dig up that info? Googling around hasn't turned up anything I could work with, though I could just be searching with the wrong terms.

Thanks in advance for any help!