The innovative CMMG Mk 57 conversion kit allows AR owners to get in on the current 5.7x28mm craze.
While the 5.7x28mm cartridge has seen a resurgence in 2020, there have been attempts to make it into the mainstream before.
Ruger boosted the profile of the 5.7x28 mm cartridge with the launch of its Ruger-57 in 2020.
CMMG expanded its collection of 5.7x28 mm offerings with an AR-15 conversion package in 2020.
In conjunction with several new 5.7x28 mm guns on the market, Speer Ammo rolled out an all-new Gold Dot load in the high-speed chambering.
Watch this "I Have This Old Gun" Segment from a recent episode of American Rifleman TV to learn about the unique 5.7 MM Johnson Spitfire Carbine.