Mike, I returned your pm...
If you are planning to shoot both supersonic and subsonic, then I would consider an adjustable gas block and pistol length gas system; supersonic only: carbine length is good.
I personally did not want the hassle of notifying the ATF whenever I cross state lines with my rifle, so I chose 16" and decided not to SBR.
Last edited by HotLead; 04-20-2009 at 09:35 PM.
Reason: added gas system comment
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