Interdynamics MKR

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Interdynamics MKR
Type Bullpup assault rifle
Place of origin Sweden
Production history
Designed 1980s
Manufacturer Interdynamics AB
Weight 3 kg
Length 840mm
Barrel length 600mm

Cartridge 4.5×26mm MKR
Caliber 4.5mm
Action Blowback
Maximum firing range 300m
Feed system 50-round detachable box magazine
Sights Iron sights

The Interdynamics MKR was a Swedish prototype assault rifle developed in the 1980s. The weapon never proceeded beyond prototype stages.


The Interdynamics MKR was originally designed using a 4.5×26mm MKR round using solid brass bullets. Its purpose was to provide a flat ballistic trajectory along with armor-piercing capabilities with low recoil for the user to handle, even when fired fully automatically.

An additional part of the concept was for it to use a low cost ammunition type. The 4.5×26mm MKR round was claimed to be ballistically as effective at 300 meters as the 5.56×45mm NATO round.

Another interesting feature about the weapon is that it was bullpup in design, which means that the magazine is located behind the trigger, and also utilized the blowback system of operation. The bullpup design was a significant tactical advantage because it increased the firearm's compactness and allowed for a smaller, lighter and more efficient firearm.

See also[edit]