I have a cheap Tactical Macining stripped AR 15 lower and some spare parts I bought long time ago. So why not assemble yet another AR 15? I would like to find a budget complete m-lock upper 16" that would be reasonably accurate to up to 300 yards. It looks like PSA and Aero Precision are similar in prices and may do it. Can you please recommend what would be the best option, can be a different brand? I am willing to pay a little more for a visible difference in accuracy.