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The Interdynamics MKR assault rifle was another unsuccessful and unconventional design of the Swedish company Interdynamics AB.
Overview[]
The 4.5mm MKR was designed in 1978 by Interdynamic AB, a Swedish company, around the time of the rise of "micro-caliber" popularity. Firearms companies everywhere were trying to achieve a type of practical, light and cheap ammunition. Micro-caliber (less than 5mm / .20" caliber) ammunition makers wished to achieve high velocity, flat trajectory and good penetration while keeping weight and recoil low so as to facilitate controllable use in individual automatic weapons.
The 4.5mm MKR was essentially a .22 WMR rimfire case necked down from 5.6mm to accept a 4.5mm bullet, for use in the Interdynamics MKR rifle and carbine. It would be supplied in single-use, 50-round polymer magazines. The cartridge featured a curved taper of its body to aid extraction and a short, shoulderless neck. Its 4.5mm caliber boat-tail spitzer bullet was 22mm long and made by cold rolling solid copper wire.
Due to concerns about stopping power, reliability, and problems with using rimfire ammunition, the MKR project was abandoned at the prototype stage and the 4.5mm MKR never saw service or any kind of widespread use.