The 4.5mm MKR, also known as the 4.5mm Interdynamic or 4.5mm Kjellgren, was a Swedish prototype rimfire cartridge developed for the prototype Interdynamics MKR bullpup assault rifle and carbine. == History == The 4.5mm MKR was designed in 1978 by Interdynamic AB, a Swedish company, around the time of the rise of "micro-caliber" popularity.
The 4.5mm MKR, also known as the 4.5mm Interdynamic or 4.5mm Kjellgren, was a Swedish prototype rimfire cartridge developed for the prototype Interdynamics MKR bullpup assault rifle and carbine. == History == The 4.5mm MKR was designed in 1978 by Interdynamic AB, a Swedish company, around the time of the rise of "micro-caliber" popularity.
Source: Wikipedia "4.5×26mm MKR" · CC BY-SA 4.0
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