Grand Theft Auto 5 contains a host of weapons for your player characters—Trevor, Franklin, and Michael—to equip throughout the game. They range from the fist everyone's come to know and love, and simple handguns, to high-tech weaponry like the Accuracy International AWM L115A3 sniper rifle and the Milkor MGL (multiple grenade launcher), or M32. This lightweight semi-automatic 6-shot grenade launcher will make short work of anything in your sights.
With that in mind, one user named IDredMan on the unofficial Grand Theft Auto forums has cropped out pictures of each of the game's weapons, as spotted in some of its trailers and screenshots, to depict the weapons as they look without the presence of the weapon wheel. Also seen are some of the utility items, like C4 explosives, and the parachute pack.
Glock 17
Mk. 48 Mod 1
Colt AR-15
Accuracy International AWM L115A3
Fist/Melee
Mossberg 590
Milkor MGL
C4
Parachute
It's not known whether these are all the weapons you'll be able to equip in the game, but it's a good chunk of them, and you'll have to either purchase them from the Ammunation store or grab them off the bodies of dead bad guys.
We'll be sure to update this post as more screenshots and icons become available of the game.