I like it! Definitely looks like it means business, but doesn't scream "tacticool" or would be too heavy from all the accessories. My only small critique is look into getting a different pistol grip because there are plenty of them out there that are notably more comfortable.
I hadn't really given much thought about being able to buy AR-type rifles in Europe.. that's pretty cool that they are available!
I will say on my work M4, I've completely given up on panels to go on the quadrail. All the panels I've had have broken and tend to slide off completely or at least move around while you're trying to hold it. And they add weight (granted not much), which is a bad thing. Holding it without them isn't a problem with bare hands, much less with gloves on. Hopefully yours are more reliable than mine.