I'm also a big ruger fan but in this case I would recommend against them. the piston system gives them hit or miss reliability that you have to constantly fine tune
No disrespect, but you clearly don't own one of the Rugers. They are very reliable and NEVER require any fine tuning. You can find a score of "torture tests" that people have done that back up my reliability claim. I do own a 556, and have fired around 1000 rounds through it give or take. I shoot military stuff, my own hand loads, old varmint .223 rounds....basically anything I can find. It have never jammed, never failed to chamber or failed to fire. I leave the piston setting on #2 and then pull the trigger. 50 grain up to 70 grain reloads...as long as you can fit them in a magazine they'll function right through it.