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Doesn't a MOE handguard require a handguard cap?

The deal with the gas systems for 16" barrels is this:

-The carbine length is designed for 14" barrels and the like
-The longer the round spends in the barrel past the gas port, the more pressure builds, making the gun cycle harder
-The mid-length was designed to make a barrel to gas port ratio more in line with the rifle length barrel
-The mid-length system is more attractive because it leaves less exposed barrel, which awkwardly protrudes from a carbine forend (YMMV)
-adjustable gas blocks serve the same purpose in the over gassing department

As someone mentioned you can get a low profile adjustable gas block and a mid-length free float rail, then have the gas system neatly tucked away out of sight, no over gassing, and the whole aesthetic thing I keep harping on.

*edited for grammar

I second the Daniel Defense barrel. Have you considered going the mid-length gas system route? I will keep the cycle pressure down, and I personally think it looks more appropriate on a 16" barrel.

Also check out the BCM Gunfighter line of charging handles. I will never go back to anything else. They are like a rock.
http://www.bravocompanyusa.com/BCM-GUNF ... %20762.htm" onclick="window.open(this.href);return false;

Let me add a congratulations to your venture. I think it makes you really appreciate the machines that are firearms to put one together yourself and be fully responsible for its function.