Service Weapons is a quick FIST supplement that adds custom legendary weapons to the game.
The PDF is 2 pages with a dense but cleanly written chart and bare text.
The contents of the PDF are short and to the point, and consist of some brief directions and then a table of traits you can roll for the weapons. These traits are all solid, diverse, and change gameplay in meaningful ways.
Overall, this is a lightweight but very easy to incorporate FIST mod. If you want a little more mechanical color and some special weapons, I'd definitely advise picking it up.
Minor Issues:
-LEECH does sort of the opposite of what its name suggests it could do.