Both the old guns and models will most likely have to be readjusted and LUA scripts written for the bipeds before they are usable in the current GameGuru..
But someone with more experience may have better info, so correct me if I'm wrong!
If you haven't already gotten it, here is some nice WW2 stuff and I know that most of the static entities work in gameguru now.
Modern Warfare --
https://forum.game-guru.com/thread/208967
best,
jan
Windows 10 64bit, Intel(R) Core(TM) i5-4590 CPU @ 3.30GHz, 3301 Mhz, 4 Core(s), NVIDIA GeForce GTX 960 2 gig GDDR5, 16 gigs ram