Congrats on the bolt gun!
All of my 45 ACP parts have arrived and I dropped the barrel off on Monday to get it cut and threaded 5/8-24.
I've decided to go with 9" as I don't think you gain anything from any longer barrel, but 9" does show a decent increase in velocity over the 8". Plus by the time I hang the Octane on the end, it's back to 16".
The main reason I bought a 16" barrel and getting it cut is the 10" barrels were harder to find and actually cost more (8" and 16" are easy), and the few I did find were threaded .578-28 which does not match with my Octane... so in any case I'd have to either pay for barrel threading or buy a new mount for my Octane... I chose new threads.
