Arms Unlimited Exclusive Colt MK12 HBAR 18″ Special Purpose Rifle & Upper Receiver Assembly

In 2018 and 2019, Arms Unlimited has been selling exclusive “MK12″ heavy barreled 18” special purpose rifles and upper receiver assemblies. You can see the complete rifle here: and the upper receiver here: I have added the available information on these unique offerings to the “Upper Receiver” section and “Rifle” sections here on The Colt AR-15 Resource. The links provided above will likely go inactive once the limited stock is sold out by Arms Unlimited.

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