The new drop button is Q (you can look up input bindings in Project Settings->Input). The swat guys are actually only a test I made and were not intended to be in the release version because they didn’t work right as you mentioned. The problem is that they use a different skeleton with different bones, lengths and rotations. For the aim animation the skeleton has to be very precise though, since only if an arms bone is for example 1cm shorter than in the original UE4 skeleton the sight will be 1cm away from where it is supposed to be.