The Spz-kr was an assault rifle that was invented during the latter days of the Third Reich. It was one of the "last ditch" weapons alongside the VG 1-5

Volkssturmgewehr 1-5

The Volkssturmgewehr 1-5 is a set of 5 rifle designs developed by Nazi Germany during the last months of World War II...

, StG 45(M), and MP 3008

MP 3008

The 9 mm MP 3008 was a German substitute standard submachine gun manufactured toward the end of World War II in early 1945....

.

Overview

The overall weapon is largely made up from Sten MKII

Sten

The STEN was a family of British 9 mm submachine guns used extensively by British and Commonwealth forces throughout World War II and the Korean War...

 submachine gun components, most notably the receiver and buttstock. The magazine and magazine release are from the StG-44. All variants are capable of semi-automatic and sustained fire. Single-shot fire could be applied by pulling the trigger half way, while pulling the trigger further to the rear produced burst fire. This function predates the similar operation used on the present day Steyr AUG

Steyr AUG

The AUG is an Austrian bullpup 5.56mm assault rifle, designed in the early 1970s by Steyr Mannlicher GmbH & Co KG . The AUG was adopted by the Austrian Army as the StG 77 in 1977, where it replaced the 7.62mm StG 58 automatic rifle...

 series of rifles. It was designed by Heinrich von Wimmersperg of Austria, who after WWII, moved to Detroit, Michigan

Michigan

Michigan is a U.S. state located in the Great Lakes Region of the United States of America. The name Michigan is the French form of the Ojibwa word mishigamaa, meaning "large water" or "large lake"....

, as part of Operation Paperclip

Operation Paperclip

Operation Paperclip was the Office of Strategic Services program used to recruit the scientists of Nazi Germany for employment by the United States in the aftermath of World War II...

, and continued to invent and design. In his later years, he designed many car seats for infants and toddlers.