The CMMG Mk57 offers a unique AR-15 platform in 5.7x28mm, providing a balance between 9mm and 5.56 performance with reduced recoil. Its Radial Delayed Blowback system enhances shooting comfort. While 9mm remains a cheaper, more available option, the 5.7x28mm caliber boasts superior ballistic performance, lighter weight, and armor-piercing potential.
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