I think I am going to continue posts on weird weapons.
The Calico M950 was a cool looking 9mm pistol with a 6 inch barrel that came with either a 50 round or 100 round helical magazine that sat on top of the pistol. Obviously, when fully loaded with ammo, this "pistol" could weigh in at almost ten pounds... it was 4 pounds with a 50 round magazine that was empty.
The pistol was made by Calico Light Weapons Weapons Systems. The pistol ejects empty cases from a hole in the bottom of the gun. This pistol used a roller delayed blowback system, similar to the HK Mp5 submachine gun and CZ-52 pistol. It was fully ambidextrous.
Calico also made variants in 22 Long Rifle, as well as carbines and submachine guns in both calibers. The submachine gun is supposed to be able to shoot 750 rounds per minute in full auto. Calico is still making these guns.