RRA is a good rifle, i don't know about the ATH (or what it stands for), but i have a Rock River AR, it's had over 3,000 rounds put thru it w/o a hitch. 1 MOA @ 100 yds........guaranteed. 16" Mid-length M4.
"they may get me in a rush, but not before i turn your head into a canoe....." -Kurt Russell (Wyatt Earp) in Tombstone
"It is when people forget God that tyrants forge their chains." Patrick Henery ... "The thing that separates the American Christian from every other person on earth is the fact that he would rather die on his feet, than live on his knees!" George Washington