That muzzle reminds me of that wonky recoil reducing one on the SCAR L.

Another good one from terrabyte.

Wondering if he would draw a genderbent Jeremy Clarkson shooting from a Mercedes-Benz SLS AMG. Or just a girl recreating that scene from the (third iirc) USA Road Trip.

It's a Noveske KX3 flash suppressor. From what I hear it's primarily used on short-barreled rifles to throw the flash and overpressure forward and away from the shooter, as it's not very good at much else (flash or felt recoil/muzzle climb reduction), and rather heavy as well.