- Green Ronin's Ultramodern Firearms: Nice layout, great illustrations, maybe wastes a little space. Could have fit more guns. Rules for D20 Modern.
- D20 Modern Weapons Locker: More weapons and variants described, filled to the brim. Less space devoted to individual weapon descriptions, layout feels crowded, illustrations not as great as UMF, lots of stats/mechanics used from UMF. Rules for D20 Modern
- Spycraft's Modern Arms Guide: Less weapons than UMF and WL, less illustrations, less text per entry, the book is not a dedicated gun book. The rules are more varied and interesting, this could be due to the use of the Spycraft rules.
I am already planning of creating a big gun table that indicates in which book they are covered.
I also intend to create a table for D20 Modern and Spycraft that has the rules for all the guns i know (and can find).