The Heckler & Koch 416.
A combat tested platform that people love to hate.
When handling one of these you can feel the quality of HK parts, everything is smooth and thought out. These are over engineered and you can tell.
While most claim this is an over gassed, heavy, and rough recoiling carbine, I don't think 90% of them have actually shot one..
The 416 I currently run is a retired 416D from a SWAT team. It came with all the factory springs, buffer, and parts.(Minus the FA sear) Using this carbine with the correct parts these are awesome to shoot and with good fundamentals its as easy to control as any 12.5" AR I've shot, with just a bit more of a snap due to the piston system these use.
Currently I'm waiting for my Surefire RC2 to get out of ATF jail so I can run this suppressed.