I'm looking to build an AR pistol in .300 BLK. I already have the lower and LPK, now I need the buffer/brace and an upper. I like the prices for the PSA uppers but they don't have any in 10.5". I was originally thinking of going with a 8.5" barrel but I've had a few customers at work advocate for the slightly longer barrel. What's the opinion of this august group?
Also, if I had the money, I'd like to go with a Dead Foot Arms Modified Cycle System. It allows for either a much shorter buffer tube or a folding stock/brace that can be fired folded. You can see it here: https://deadfootarms.com/ar15-foldin...-adaptor-kits/