This gun is marked RS2 and it has the RS2 trigger, but the box says RS1. Like getting 2 rifles for the price of one! Includes .177 caliber and .22 caliber barrels. Red fiber optic front sight and green fiber optic rear (fully adjustable). The Beeman 4x32 scope will help get the most accuracy possible from the gun. Everything fits neatly inside the included soft carrying case. Velcro tie-down straps secure the barrels, gun, scope & rings to stop things from shifting during transport. Max velocity in .177 is 1000 fps, and in .22 it's 830 fps. You could use this rifle for plinking, small game hunting, shooting cans and just plain fun! When you change barrels, you MUST sight-in the gun again! It will not shoot to the same aimpoint, even if you sighted-in the barrel when swapping it previously. Every barrel switch requires a new sight-in session.