Product Information

G4 Side Charging Upper Receiver

Features Enlarged Ejection Port - Accommodates up to a .458 Socom


Non Reciprocating Charging Handle with detent to lock handle forward.

Uses all Mil-spec and most custom Bolt Carrier Groups without modification. 

Beveled Ejection Port.

Full 15 slots of Picatinny Rail.

Compatible with all Mil-spec and most other lowers.

Includes Enhanced Cam-Pin optimized to perform with side charging action.


Weight: 13.0 oz

Dimensions: 8.9 x 2.9 x 2.9 in


Proudly Manufactured in the USA (Arizona) by GIBBZ Arms


*SCU Upper not compatible with handguards with anti-rotation tabs without modifications*


IMPORTANT!! You must use the G4 enhanced cam pin in the G4 Side Charging Receiver!!!!!!

Use of the standard cam pin will cause the Bolt Carrier Group to lock up and become difficult to remove and could cause Severe damage to receiver.

Current Stock:
Width: 8.90
Height: 2.90
Depth: 2.90

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