The range of a grenade launcher is determined by the round, as that's what contains the propellant, not the gun. Shadowrun also treats all grenade launchers, ever, as thump guns, so you don't really have to worry about reduced accuracy due to a shorter barrel.
As for concealability, it states that its the pistol version of the gun, and thus should fall under the umbrella category of "Pistol Sized." Considering its a grenade launcher, I would personally say its the same size as a Heavy Pistol, and thus +0. But your GM may be generous and say Light Pistol, for -2.
Either way, as a Pistol sized weapon, you could fit it in a Hidden Arm Slide.