Just to clarify - its not proprietary to our barrel. It should work with any barrel and lower out there!
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I have a 5.5 AR-9. I have thought about adding an 7.5 or a 8 inch.
5" is what I found to be the optimal length. I like the 5" barrel a lot.
I like 5" as well. Most people with an AR9 want it because they want to suppress it. 5" gives solid ballistics and any longer just makes it longer
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4.5" for suppressed. If not suppressed, then the 5.5" allows you to use a flash can with fore ends in the 7" range and have part of the can sticking out which is more aesthetically pleasing to me. The 8.5" allows you to add a brake with fore ends in the 9" range. Anything longer than 8.5" kinda defeats the SBR benefits on a 9mm. Also, the Faxon barrels are very nice. Most other 9mm barrels are of the gov't style thicker heavier barrels.