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Fifteen slots

Yes, really, fifteen inventory slots.

01) Rifle / scoped rifle / shotgun / smg
02) Melee weapon
03) Defibrillator
04) Medkit
05) Pills / shot
06) Not used because it discards when you scroll away from it (This is why one item is getting dropped a lot in the videos. I hadn't figured it out when I recorded them.)
07) Grenade launcher (Chainsaw's slow to start and M60's just another spray-gun so this one gets the keyboard shortcut.)
08) Molotov
09) Pipe-bomb
10) Bile jar
11) Explosive ammo pack
12) Incendiary ammo pack
13) Cola bottles (here so you can fight your way to Whitaker's door with the bottles "in your pockets")
14) Pistol(s) / Deagle
15) Chainsaw
16) M60
01) Rifle / scoped rifle / shotgun / smg

Mouse-scrolling through them won't always work in that sequence, but the keyboard shortcuts 123457890 should work consistently.

Let me know if you want a version of this that includes my half-power guns.