The HK51 Bravo is an aftermarket carbine length conversion of the German Heckler & Koch HK21 general-purpose machine gun, made by F. J. Vollmer & Company Incorporated. In other words; it's a flashbang.
Model, UV's and Bakes were outsourced to Blue Papillions: https://www.artstation.com/bluepapillions
Textured in-house by me.
Made for the McShay Weapon Pack for Payday 2