And yeah, I've spent a little time in places with "fine sand". Granted, I wasn't doing any shooting, but it's not really hard to keep an M4 clean enough to fire.
I've run my ARs wet, bone-dry, and everywhere in between. Both were basic M&Ps. I can't make them stop working.
Sure, the piston system is probably a better gas system. But going off Tahunua's analogy, a Lambo is going to beat a Mustang all day long, but at the end of the day, my Mustang gets me to work and back just fine.
TXARNG: 2007 - Present
"We're gonna turn left!!" - NASCAR, in a nutshell.