A lot of times courts will take seized weapons and turn them over to police. Some judges do it to every gun that doesn't get returned. EVERY gun. From junk Saturday Night Specials to M60's. I highly doubt that the agency went out and bought an M60.
Our firearms unit has a bunch of strange stuff that they can never really get rid of, or use.
As for the 113, they are unarmed (usually) and good for rescuing people pinned down.