that looks like the quick disconnect from a remote line. jw, how come you have a df and a remote line. anyways, i don't dislike flatlines, but i don't like em that much either, but that low pressure kit is good. an e-grip or response trigger would make that a real nice a-5....possibly even pimped...possibly.
i hate custom A-5's they dont look cool with expansion chambers and lp kits. They make it non mp5ish. And i think it looks horrible. I love how a stock A-5 with a flatline looks and performs. and for what you paid for all that you could have had an impulse or something. But what ever floats your boat. 4/10