In the mid 1980s, an Italian designer named Alphonso Giambelli developed a bullpup pistol-caliber carbine with hopes of selling it to Italian law enforcement. That never happened, but the gun was offered on the commercial civil market as the semiauto AGM-1 by a company named Algimech (after ALphonso GIambelli). At least a handful of these carbines came into the US before the 1989 assault weapons import ban, chambered for 9mm Parabellum and 9x21mm. they were also offered in a variety of other calibers (.45 ACP, .45 HP, .22LR, .22 WMR) but it is unclear if any of those were ever manufactured.

The AGM-1 has an 18" barrel and uses slightly modified Browning High Power magazines for both 9x19 and 9x21mm. The barrel is easily removed, and there is nothing particularly complex about its design.