ZCI M4 Metal Hopup Unit

This is a complete hop-up unit for M4 and Armalite series rifles. It's main body is made from zinc which is more rigid than stock plastic hopup units, this added rigidity increases accuracy with proper tuning. It comes complete and pre-assembled with all the parts of the hop-up unit including the barrel locking ring and a hopup arm nub (no bucking included). Compared to a Lonex unit there is a slight bit more slack in the gears but the postition retention of the main drive cam is pretty good.



Specifications:
- Materials: Zinc and plastic (nylon?)
- Use: M4/M16 and other Armalite series rifles