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| Prefix/Pattern | Likely Meaning | |----------------|----------------| | DDxxxxx | Standard production AR-15 lower (complete rifle or receiver) | | DVxxxxx | Daniel Defense “DD4V” series (e.g., DDM4V7, DDM4V11) | | DDPxxxx | Pistol lower (for AR pistol builds) | | CMxxxx | Contract or military/law enforcement overrun |