The Heavy Assault Rifle is similar to the the standard Assault Rifle, in difference it has a heavy barrel (HBAR) for more damage output in less time. Due to space restrictions the rifle comes without an underslung rifle attachment. It's designed as an excellent crowd control weapon mainly used for support-roles as it closes the gap between the class-specific machine guns and the Combat Rifle. It was contributed to the game by Sk1p.
The 22A5 Heavy Assault Rifle is a larger caliber variant of 22A3-1 Assault Rifle. Designed to be more efficient against armored targets. The underslung grenade launcher is replaced with a function-augmentation mechanism which, upon activation, significantly increases rifle's fire rate for a short duration of time.