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HD4 upper receivers (13)
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Upper receiver assemblies built around the standard M4 gov't profile barrel.
*Select models are available as SBR variants for an additional fee.
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HD4-SPR upper receivers (5)
- The Henderson Defense "Special Purpose Receiver" is our interpretation of the US Navy's Mk 12 SPR project. Our vision of the SPR uses high quality components for maximum performance at an economical price for the shooter.
