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The Gibbz Arms G4 Side Charging Upper Receiver is a non-reciprocating upper receiver with a detent to keep the charging handle forward during operation, and uses all mil-spec and most custom bolt carriers without modification. The Gibbz Arms G4 Side Charging Upper Receiver features an enlarged ejection port and will work with AR-15 calibers from 22LR to 50 Beowulf.

  • Beveled Ejection Port
  • Full 15 Slot Picatinny Rail
  • Bolt carrier door in the rear to allow for easy bolt carrier removal and gasses in during operation (important for suppressed fire).
  • Compatible with Mil-Spec and most other lowers receivers
  • Enhanced cam-pin optimized for side charge upper with Melonite coating is included
  • Charging handle cover keeping operating gasses in (also important for suppressed fire).
  • Weight: 13.0 oz.
  • Dimensions: 8.9 x 2.9 x 2.9 in
  • Made in the USA

NOTE: Must use the G4 Enhanced Cam Pin (included)- use of standard cam pin will cause BCG to lock up and cause potential damage.


AR-15, Issue:11, Page:004
Big Book Catalog, Issue:72, Page:004

GIBBZ ARMS - AR-15/M16 G4 SIDE CHARGING UPPER RECEIVER

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Cartridge: 223 Remington, 5.56 mm NATO

Finish: Black

Style: Stripped