SCAR-Hs 16" barrel configuration - FN refers to as STD for Standard length. I think of as "Carbine" configuration. The SCAR-H with a 20" barrel referred to by FN as LB for Long Barrel. I think of as "Rifle" configuration. We should not think of these shorter barrel weapons as "rifles" because that obscures the fact that shorter barrels = lower muzzle velocity = shorter effective range. Bottom SCAR has FN EGLM grenade launcher.