The Daniel Defense M4A1 Rail Interface System RIS II is not compatible with an Aero Precision M5 upper. This rail is designed for AR15 pattern receivers, not DPMS pattern.
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by Shotgun, from OK, United States Asked on October 4, 2022
The Daniel Defense M4A1 Rail Interface System RIS II is not compatible with an Aero Precision M5 upper. This rail is designed for AR15 pattern receivers, not DPMS pattern.