Designed in the K-Style and constructed with CNC aluminum, this receiver set provides a sleek and durable upgrade for your MARUI MWS M4 GBB. 

Includes:

• Upper and Lower Receiver ( CNC Machined by 6061 Aluminum, Individual Serial Number is Engraved )
  
• Ambi Bolt Release Lever ( Constructed by Steel in QPQ )
  
• Ambi Mag Release Assembly ( Constructed by Steel in QPQ )
  
• Ambi Selector Assembly ( Constructed by Steel in QPQ )
  
• Front and Rear Take Down Pins ( Constructed by Steel in QPQ )
  
• Dummy Hammer / Auto Sear Pins ( Constructed by Steel in QPQ )
  
• Dummy Chamber Insert ( 6061 Aluminum with Clear Finished )