This is a aluminum nozzle with O-ring for M4 series rifles. The O-ring stops air from leaking between the cylinder head and nozzle, all stock nozzle...
This M4 high cap flash mag from ZCI offers an alternative to conventional high cap winding wheels. It maintains the high capacity but instead of the...
This polymer crane stock provides a more substantial stock for better cheek weld while still maintaining a low weight. The butt pad is a medium soft...
These ZCI piston heads are most likely made from a nylon composite and come in two different versions. The threads are supported by a brass nut that...
Here are the ZCI reinforced D-type pinion gears. These are made with a different manufacturing process than normal powdered metal pinions so they are...
A common problem with stock M4 grips is the screws used to attach the motor plate are often coarse thread and screwed directly into the plastic grip....
These vertical grips from ZCI are a great addition to any setup, made from 30% glass fiber reinforced nylon they are ready for any abuse. These have...