I suppose this should be more for the pistol forum but here we are... 7.5" or 10.5" barrel for a PDW type setup?
The one I bought is 8.5". I have 300 BLK pistols/SBRs as short as 6.75" and as long as 11". I would say you are good with either 7.5 or 10. Just your personal preference
PSA is typically budget build stuff, but if you aren't trying for sub MOA out of the 300 BO then you should be fine. Typically you can get 2 MOA out of their barrels.
I have their 10.5” 300Blk premium upper on my SBR. As far as accuracy goes, I have it zeroed with one particular brand of 220gr loads and I can get MOA easily out to 100 yds. I have it zeroed at 50 and it wears a 1-4 Vortex MilRad scope which is perfect for what I use it for. I’d say you’ll be fine with PSA based on my own experience with them.
I have one of their 8.5" pistols with a Silencerco Omega. It has been a joy to shoot
No issues at all so far. I've put 220gr subs and some 125gr frangible through it to date.Great to hear. No problem with indexing?