It's not the best weapon in the game, but it is arguably one of the most versatile. Its usefulness cannot really be understated it can be helpful in practically every fight you face. Leveling it up and spending Raritanium will earn you a weapon with the speed of a submachine gun with a three-shot spread. It's also extremely easy to strafe and avoid enemy projectiles while you hold down 'R2' to let your pistol go to work. The Blast Pistol works extremely well as a rapid-fire weapon to keep pressure on enemies while providing consistent damage. It's the first weapon you get in the game, but don't think that you won't need it once you buy a second weapon. It shouldn't be a surprise to see the Blast Pistol on this list. In other words, the weapons that will aid you the most at the beginning and be consistent throughout the rest of your playthrough. This Ratchet and Clank weapons guide will walk you through which weapons you'll want to focus on first. While that decision can boil down to your preferred playstyle, there are some specific weapons you should focus on early in your playthrough.
Since Raritanium lives up to its name for being well, rare, you'll need to pick and choose where and how to spend it.