As a follow-up to my post about installing ARC rail adapters for a COMTAC headset, the question was asked on the Pyramyd Airsoft Facebook Page about how one would be able to continue running a Contour HD helmet cam on the side of their helmet once the ARC rail adapters have been installed.  

The answer is quite simple, really.  I didn't provide a complete tutorial on the first go around.  The ARC Rail Adapter come with short, Picatinny rail mounts which sit on top of the adapters, allowing you to mount anything with a compatible rail mount on them.  This would obviously include the Contour cameras, but also a helmet light, or maybe something else cool that I didn't even know about.  
Anyway, here is the photo illustration of the Picatinny rail attached to the ARC rail adapter for my COMTAC headset.
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Picatinny rail attached to the Z Tactical ARC Rail Adapters for COMTAC Headsets
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Today, I thought I'd take you into the world of gear whores for a minute and show you how to quickly install a set of ARC helmet rail adapters on your COMTAC headset. 
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Just to give you a little background on why this is a useful thing to do, aside from that fact that these adapters will make you look more like a high-speed operator, I feel compelled to mention that I have a fairly large skull.

Consequently, not all helmets fit me the same way and sometimes, as in the case of my Air Frame helmet here (it's a knock-off, I ain't gonna lie), the darn thing is just too small when you factor in that I always wear a shemagh on my head as a sweatband.  It's pretty much a must because I get so hot and sweaty when I play that my goggles go beyond fogged and just get covered in liquid sweat, reducing my visibility to pretty much zero.

SOOOO, long story short, I don't have any room inside the helmet for the somewhat bulky COMTAC headset.  Installing the helmet rail adapters for my COMTACs alleviates that issue quite well.