Action Army AAP01 GBB Part - Rotary Hop Up Chamber Valken AEGs You cannot use an aftermarket

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

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

Use this if you extend your rifle out with a longer outer barrel and/or faux suppressor

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

FPS is 330 w/

Action Army AAP01 GBB Part - Rotary Hop Up Chamber Valken AEGs You cannot use an aftermarketAction 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.