I've just started investigating 300 blackout uppers for my M&P15. I'm not looking for the "best" just a "decent" upper. The ones at which I've looked so far are by Hardened Arms and Palmetto State Armory. They both have what I want but I don't know anything about them. I've read comments in some of the forums about their uppers and all of them have been positive. Any input you can give about the companies and/or their products will be much appreciated. Thanks!
Brock
Brock