At 43.5 oz, I'm guessing that (if to be used for Carry Optics) once you remove the mag-well and the plate with the rear sight, then add an optic, you'll still be under the 45 oz max weight for CO gun. I've got a gen 1 X5 set up for CO now (SPP adaptor plate with DPP), but my son is wanting to take over that pistol. I may have to pick up one of the new Legions to replace it.