Fallout 4 has 60 base Weapons, not including throwables, not including mods.
Fallout New Vegas has 130 base weapons, 209 with unique variants, not including throwable, not including mods.
Fallout 4 has 24 different ammo types
Fallout New Vegas has 28, which can all be modified at a reloading bench giving them all different properties, making the total number of different ammunition types around 110
6 hours into the game, I felt like i'd seen all the weapons. I hadn't the slightest sense of adventure because there were no cool rewards for me to retrieve, other than a hunting rifle with a "Legendary effect". These legendary effects are NOT excuses. Aside from the deliverer, and the like, what, 2 other weapons with unique appearances, they are all based off of these "base weapons" with added effects. Where is the gun variety at all? This just comes off so lazy.