This technical review of the Olympic Arms MPR 308-AR highlights its unique convertible design, allowing a switch between .308 Winchester and standard AR-15 (5.56 NATO) upper receivers. The review details the proprietary lower receiver's dual lug system and the conversion process, emphasizing the use of a specialized buffer and bolt carrier group for .308 operation. While the 5.56 conversion utilizes standard AR-15 components, the .308 configuration features a proprietary single-column steel magazine and a modified bolt carrier group.
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