 The HK91, HK93 and HK94 models were all on the import ban list.At the time of the ban, about 130 or so HK91s had already been delivered to the U.S. but had not yet cleared customs.H&K complied with the ban by renaming those HK91s as HK911 (basically stamping another "1" after the name) and adding a Bell-Carlson thumbhole stock.