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  2. PART 1 of 2: How to assemble an AR/M4 lower receiver

    PART 1 of 2: How to assemble an AR/M4 lower receiver

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  3. PART 2 of 2: How to assemble an AR/M4 lower receiver

    PART 2 of 2: How to assemble an AR/M4 lower receiver

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