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.