CMMG MK3 .308 Lower Parts Kit

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CMMG MK3 .308 Lower Parts Kit

This is a complete lower parts kit for DPMS pattern .308 lower receivers. Please read note below to determine if you may also need an extended length mag release button. These are proudly made in USA.

Parts are organized into color coded bags which contain:

  • Clear
    • .308 Takedown Pin
    • .308 Receiver Pivot Pin
    • Takedown Pin Detent (2)
    • Takedown Pin Detent Spring (2)
  • Yellow
    • Bolt Catch
    • Bolt Catch Plunger
    • Bolt Catch Screw
    • Bolt Catch Spring
    • Buffer Retainer
    • Buffer Retainer Spring
  • Blue
    • Magazine Catch
    • Magazine Catch Spring
    • Standard Size Magazine Release Button
  • Green
    • Safety Selector
    • Selector Detent
    • Selector Detent Spring
    • Lock Washer
    • Pistol Grip Screw
  • Red
    • Hammer & Trigger Pin (2)
    • Hammer Spring
    • Trigger Spring
    • Disconnect
    • Disconnect Spring
  • Hammer
  • Trigger
  • Pistol Grip


**Please note that we recommend buying the AERO Precision Extended Mag Catch Button for .308 as it is not included in the kit. The button is a drop in replacement for the standard lower receiver magazine catch button. This extended button is longer, allowing it to protrude the proper distance when used with our lower.