To be imported into the US, a handgun must "earn" enough points from an established grading system. Meant to keep out cheap, poorly constructed firearms, it also limits the ability to import a polymer framed pistol in certain calibers. Every imported Glock pistol was wearing an adjustable sight when it came into the US. Those models in .380 can only be sold to law enforcement agencies willing to do the paperwork. Most won't. Why carry a .380 when the same size pistol is available in 9mm Parabellum.