Action Army AAP01 GBB Part - Black Mamba CNC Upper Receiver Kit (AAP01) Helmets and Accessories A much nicer upgraded hopup

A much nicer upgraded hopup chamber for use on AAP-001 airsoft pistols

Lots of coverage and protection from airsoft BB hits

This gun is great if you are looking for a M4 with a longer barrel and rail system

you wiggle the front adjustment (not receiver button like a normal AK) to expose the battery compartment

Action Army AAP01 GBB Part - Black Mamba CNC Upper Receiver Kit (AAP01) Helmets and Accessories A much nicer upgraded hopupAction Army AAP01 GBB Part Black Mamba CNC Upper Receiver Kit (AAP01). A very nice full metal slide upgrade to any existing stock AAP pistol. Full top rail and extra enhancements for the ultimate custom pistol. Made to fit specifically on the airsoft AAP01 gas blowback pistol. Official Action Army product. Easy to install and upgrade with. Has outer metal 14mm CCW threaded extension on the slide built in. STYLE 1 (AAP01)