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Aero Precision M4E1 Threaded Stripped Upper Receiver - Anodized Black - APAR700201C
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Aero Precision M4E1 Threaded Stripped Upper, No Forward Assist - Anodized Black - APAR712201C
Aero Precision M4E1 Threaded Stripped Upper Receiver - Anodized Black - Minor Cosmetic BLEM - APAR700201BC
Aero Precision M4E1 Enhanced Upper Receiver .223/5.56 NATO - Anodized Black - BLEM - APAR600201BAC