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Thank you for the follow-up. I been reading about a week now on the 300 blackout. It came out that the 7 and the 9 is perfect for home and "above medium range" using 150 grain. This might be ideal for me because my AR-15 is a 16.5 and it can far and accurate enough. I'm trying to contact the PSA just to make sure what else I need to compete and get this shipped to me. Thank you for the follow-up again. It made it easier..
Also in terms of choosing barrel length, here is a graph showing ft lb of energy by barrel length (use the blue line). This is for supersonic rounds, not subs. Also keep in mind shorter barrel lengths = more blast, flash, and concussion than longer lengths. I can't speak to reliability of different lengths of 300 BLK cuz I don't know enough about it. Maybe someone here can chime in on that. I Apologize for messy chart. I keep adding stuff to it ha ha.
Mags are the same (thus the need to make sure to keep separate from .223).
Also a reminder that the PSA upper you linked earlier is not a complete upper.