You place a simple COMPACT MIRROR directly underneath a RAYGUN and enter in the code 224. The beam envelops the RAYGUN, then bounces off the mirror back up to the MULTI-USE BEAM STATION itself, creating another MULTI-USE BEAM GUN!

You're not sure why the MULTI-USE BEAM STATION didn't get consumed in the process like all your other item combination has. Maybe it's more of an immutable fixture here than the other things in the laboratory are, which would explain why there isn't a bin full of them.

You go ahead and make two of these too.