never mind after some more research i found what i was looking for. dissy is a rifle length forearm with carbine gas system but the Recce is a 16 in barrel with a mid length gas system and a rifle lenght forearm.
"Which is heavier a soldiers pack or a slaves chains" Napoleon
"We cannot defend freedom abroad by deserting it at home."Thomas Jefferson
"You know why there's a Second Amendment? In case the government fails to follow the first one."
-- Rush Limbaugh, in a moment of unaccustomed profundity
"No combat-ready unit ever passed inspection, and no inspection-ready unit ever passed combat."