Hello and thanks for making me spend more $$ .
Picked up a 450 bushmaster upper today and slapped it on a PSA lower with a collapse able stock I had in the safe. It's definitely a little snappy and the 1st round stovepiped. The next 2 fired and ejected fine. I think I can make this work.
Bought a Burris PEPR mount, 60 Hornady rounds, and a spare Bushmaster 5 round mag. I know I probably paid too much, but it was from a local mom and pop shop type here in Michigan's thumb. Rather give them a few extra dollars than the big guys.