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M4A1 vs. AK-103: AR-Style and AK-Style Rifle Platforms Compared The M4A1 and AK-103 represent two of the most recognizable modern rifle platform families in the world. The M4A1 is part of the AR-style carbine family and is commonly associated with 5.56x45mm NATO. The AK-103 is part of the Kalashnikov-style rifle family and is commonly associated with 7.62x39mm. While the rifles shown in the image are military-style examples, civilian buyers will typically encounter semi-automatic AR-15 rifles, A …