send an email to
steve @ adcofirearms.com
he deals with this stuff every day...
but i believe the RRA barrels are 16" plus the length of the muzzle device so you should be able to have the barrel cut down, threaded and still meet the min length of 16.
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this was a big issue for me because as I pieced together every weapon configuration for what i was going to build... I knew I wanted a FULL 16" barrel... i wanted it m4 profiled w/ gov. profiling underneeth the guards and etc...
the postban rra m4 barrel is not a full 16" barrel... it is with the faux FH... but the post ban is what has the light under the handguards... so what I had to do was take a pre-ban rra m4 barrel (heavy under the guards) and have steve reprofile it down to gov. profile... then make the upper, post ban compliant.
depending on how you run your setup... if your only going to have one AR and your buying it because you want a fighting weapon... it just has to be 16"...
if you got a 20", then i can see doing the whole 14.5in w/ brake...