ZCI M4 5.5in Short Aluminum Outer Barrel

These short outer barrels are great for building a compact CQB M4 “stubby killer” or “M4 pistol”. Their total length is 5.5 in with a counterclockwise 14mm thread. It's finely machined from aluminum for lightweight and has a nice black finish.

Specifications:
Total length: 5.5 in
Thread type: 14mm counterclockwise thread