#RPGaDAY2015 is the brainchild of game designer Dave Chapman. Basically, each day in August there is a question about RPGs. This is day 14.
I guess this means supplement? Seems to be, as there is not “supplement” on the list. Looking at my bookshelf, I don’t have a lot of supplements. I’m tempted to say my Acer Iconia tablet, as this is a peripheral I use a lot for my gaming, but that doesn’t seem fair.
I’d have to go with the Ultramodern Firearms, the d20 version written by Charles Ryan and published by Green Ronin. Back in the day, I ran d20 Modern campaigns and Ultramodern Firearms provided lots of great support for cool weapons carried by the spec ops PCs and their unsavoury opposition.
Wow, that was reaching back.
You can get a copy of Ultramodern Firearms pretty cheap at Paizo.