You can also run shorter barrels ... ~12" with mid-length gas, ~10 with carbine gas, or ~8 with pistol gas ... just by setting up a lower with a pistol buffer.
Here's my 12" Wilson Combat in 6.8SPC:
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Dan Wesson Guardian .45, Keltec PF-9, SIG P320c 9mm, Glock 17
Other stuff
COTEP # CBOB0618
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