These weapons were built in Poland during the occupation. I figure if they can be mass produced with an occupying army keeping an eye on the population and resources, they might be suitable for T2k.
Błyskawica submachine gun
http://en.wikipedia.org/wiki/B%C5%82...submachine_gun
KIS Machine Pistol
http://en.wikipedia.org/wiki/KIS_(weapon)
Filipinka Hand Grenade
http://en.wikipedia.org/wiki/Filipinka
Sidolówka Hand Grenade
http://en.wikipedia.org/wiki/Sidol%C3%B3wka