At the FNH USA 3Gun Championships two weeks ago, I was using my SCAR 17S. I used exclusively PMC Brass 147 gr bt fmj for the match. I have used this ammo in the past but have never witnessed muzzle flash of this magnitude from my SCAR17S. I was shooting at steel targets over 100 yards away and was noticing muzzle flash through my Nikon M-308 scope. You can see some of the muzzle flash at the end of the video when i engage the 100+ yard steel targets. My SCAR17S is still rocking the factory installed PWS muzzle brake. Other than the Midwest Industries extended handguard, some rail covers and a Geissele Scar Super Trigger, the gun is the same as when I bought it in 2012. At first I thought the muzzle flash may have been due to the proximity of my muzzle to the tree I was shooting off of, but I can see muzzle flash in the 3rd person video (which I edited out for the youtube video) when I engage the last array of paper targets with my angled irons.