Action Army AAP01 GBB Part - Rotary Hop Up Chamber Valken AEGs Flip-up integrated sights (metal) on

Flip-up integrated sights (metal) on the top rail too

The VSR specific cut is required for stock VSR-10 hop up chambers

and holds up to five M16/M4 style magazines or similar accessories

You cannot use an aftermarket cylinder head with this Action Army Cylinder

ambi mag release and a built-in mosfet

Action Army AAP01 GBB Part - Rotary Hop Up Chamber Valken AEGs Flip-up integrated sights (metal) onAction Army AAP01 GBB Part Rotary Hop Up Chamber upgrade. A much nicer upgraded hopup chamber for use on AAP 001 airsoft pistols. Easy to adjust the hop with this awesome unit. Made to fit specifically on the airsoft AAP01 gas blowback pistol. Official Action Army product. Easy to install and upgrade with.