Blem – MG4 Side Charging Upper Receiver


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– Blemished upper – only cosmetic – machine/tool lines and/or a poor anodize finish
– GIBBZ Arms Patented Left Side Non-reciprocating Charging Handle Pat. No. 9,310,146
– Billet machined from 7075-T6 Aluminum. 
– Larger Shell deflector
– Ejection port dust cover 
– Uses all Mil-Spec and most Custom Bolt Carriers without modification
– Full 15 Slot Picatinny Rail
– Rear Bolt carrier door to allow for easy bolt carrier removal and still keeping gasses in during operation (important for suppressed fire)
– Compatible with Mil-Spec and most other lower receivers.
– Included is our Enhanced Cam Pin which is optimized for our side charging upper with Melonite coating.
– Charging handle cover for keeping operating gasses in (also important for suppressed fire)
– Protected by Patent No. 9,310,146
– Manufactured in the USA (Arizona) by GIBBZ Arms.
– Weight: 15.2 oz.
– Dimensions: 8.9 x 2.9 x 2.9 in
* Upper may not come with Strike Industries parts as shown in photo because of availability. *
* Upper not compatible with hand guards featuring anti-rotation tabs without modification. *

IMPORTANT!! You MUST use the G4 Enhanced Cam Pin in the G4 Side Charging Uppers!
Use of a Standard Cam Pin will cause the Bolt Carrier Group to lock up in the G4 Upper Receiver and be VERY difficult to remove and could damage the Upper Receiver.

Click HERE for instructions on how to change the cam pin or check out our YouTube video.



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