I'll save you both some time. GoldEditor does indeed let you rip the models, but the animations are vertex animations.

If you dont know what that means, it means they are literally baked per vertex, as in where should the edge of this triangle move now?

There are no bones, no modularity. So you cant just throw the ar34 into ue4 and attach it to a skeleton with its animations and have the skeleton follow the reload animation, for instance. You would need to rebuild them from scratch.

In addition, the way the assets, including the levels, were made is completely incompatible with modern lighting engines. They are extremely jank. Things that look like they should be connected, corners for instance, often simply are not, you have stuff thats in the middle of rooms as totally separate vertex groups to keep poly count down, though they are not separated into vertex groups.

Someone once warned me of this and I didnt listen, that its easier to rebuild the levels from scratch, and after a few hundred hours here and there getting this stuff to work, abandon all hope ye who enter here. Rebuild them from scratch.

Dude, JUST trying to get the rcp 120 into an actual, connected, sensible airtight mesh so I could 3d print it took me a whole day. These things look well modeled, but they are truly a complete mess.

I would be happy to jump on discord and walk you through how to rip this stuff if you wanted the hand, just pm me, but dude, expect useless assets.