TK-77
The BWN Rk-5 and the earlier RK shared more than their initials: Outsource production contracts at Teknifunktion Inc.. When the RK series became obsolescent for state users, Teknifunktion offered their own replacement alongside competitors such as the Falil, Falu-104, RKD and ARK. The TK-77 featured a new piston, hardened receiver and a longer barrel, giving it more reliability and accuracy at the cost of weight.

TK-78
It's an application of the Ravens' Light Support Weapon, or Infantry Automatic Rifle, concept onto the TK-77. It features an even heavier barrel and a longer magazine, plus the scope used on Nationalist-762, it's an affordable mid range support weapon for clients familiar with the RK family. Unlike the Draco series, it still can be fired in full auto.

TK-80
Originally a training rifle created by removing the TK-77's piston, it gained some popularity among sports and hunting communities. Magpies and PMCs from such a background would often customize their TK-80s with sniper scopes, sometimes even integrated suppressed barrels.