There are currently 4 magnifications for weapons. 1x, 1.5x, 4x, and 6x. Every attachable scope's reticle is currently red. It is unknown at this time whether or not Ion will allow personalization of scope reticles.
Every weapon has it's own unique iron sights for a 1x magnification.
1.5x (Actual magnification unknown) Edit
There are currently two scopes in at this magnification, the red dot and the holo. The red dot is what its name implies, a scope with a red dot as the reticle. It can be applied to all weapons. The holo is a scope with a red medium sized circle (hollow) and a red dot in it's center. There are some weapons this cannot be applied to.
There is currently only one scope at this magnification, the acog. The reticle for this scope is currently a red caret.
There is currently only one scope at this magnification, the 6x (real creative, I know). The reticle for this scope is currently a red dot, much similar to the red dot scope.
There are currently two other modifiers for weapons, the silencer and the laser sight.
Every weapon type has a silencer that can only be applied to it's type: Pistol, Shotgun, SMG, Assult rifle, and Sniper.
Laser Sight Edit
Adds a laser sight to your weapon to help with accuracy. Currently unknown if it actually helps, but it is believed by some to slightly increase hip fire accuracy.