ZCI - CNC Aluminum One Piece Rotary Hop Up Chamber Set for M4 / M16 AEG Rifles
Precision CNC machined aluminum construction
Anodized finish
Durable one-piece design
Rotary adjustment dial
 
ZCI - CNC Aluminum Hop Up Chamber Set for AK AEG Rifles
This is a complete hop-up unit for AK series rifles. It's main body is made from machined aluminum which is more rigid than stock plastic hopup units, this added rigidity increases accuracy with proper tuning.
It comes complete with all the parts of the hop-up unit.