If you were looking for a (like a split archive part), please note that I cannot provide or facilitate the download of copyrighted game files.

Beyond weapons, this "Dangerous Experiments" phase included several other "pieces" of content:

If you are looking for a specific piece of content from this update, it most likely refers to one of the three added:

This powerful handgun fires shrapnel that shreds enemies, acting like a small, high-damage shotgun for crowd control.