MG4 Side Charging Upper Receiver

(3 customer reviews)


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SKU: G4UR-MG4 Category:


– 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.


3 reviews for MG4 Side Charging Upper Receiver

  1. Paul Ingargiola (verified owner)

    How are there no reviews on this product? Gibbz Arms? Originally never heard of them before and also saw a similar brand I think are made for them by Gibbz but decide to stick with Gibbz. I am a researcher and Only tend to go with the best products based off of a variety of factors. I tend to spend a very long time figuring it all out. What I concluded is that the Gibbz products are solidly constructed and blows the rest away as far as the LRBHO Last Round Bold Hold Open feature. The rest are made from weaker materials that look flimsy in the LRBHO area. The charging handle is Non-Recipricating and is large enough to grab. All around very pleased with the quality. Even the throw in parts they added in were decent enough to keep me happy until I upgrade. I am about to order my 2nd upper but will be doing the non MG4 and the lite version to trip down on my weight. Hope this helps!

  2. StephenGowen (verified owner)

    This is just an amazing upper. Quality is definitely TOP shelf. Function is a thing of beauty. I grew up on a FAL, so ARs always felt awkward to me with the rear charger. Well this fixed that AND IT LOOKS AWESOME!!. Ive built 2 and when my buddy saw and shot mine. He had to have one aswell.

  3. jmekulik (verified owner)

    After deciding I wanted a side charging upper and endless hrs of research online I narrowed it down to 3 different companies. Gibbz made one of the 2 other brands. I seen the mg4 and appreciated that it had standard features of a normal ar15 upper as the f/A and dust cover. I wrote gibbz and got very timely responses and shipping was fast. I would highly recommend this company to anybody as the upper is extremely nice and looks absolutely amazing. Thanks again to the people from gibbz for making me a very happy soon to be continuing customer.

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