Just got back from the range today (nice and bright but cold). We had 3 AR's with us...one had the standard A2 flash hider (16" barrel), next was my rifle with the Spikes STAB (Warthog) on it (11.5" barrel), and the last was the wife's rifle with the ATRS Eliminator on it (12" barrel). I'll cut to the chase...the Eliminator is FANTASTIC at what it does. The A2 was crazy loud and quite a bit of flash...Spikes was still quite loud but throws everything forward...there was still some noticeable flash. The Eliminator was non existent with any flash that I could tell (remember, it was bright out). Also, and I think this may be due to the design, the sound didn't seem so bad. I really want one on my 11.5" now...