Smooth bore polished 19mm outer, 17mm anodized aluminium inner barrel. Same size as stock/worker inner barrel.
It's good idea to use metal inner barrel if you are going to extend your inner barrel and coupling it with heavy tacticool silencer in front as the plastic inner barrel will bend due to the weight in front.
The only downside with this is that it tends to get dirty with foam bits after some game and you might need to clean it from time to time.
Inner Diameter : 17mm (approx 16.8mm)
Outer Diameter : 19mm (approx 19.02mm)
Length : 30cm
*NEW : Metallic purple color now available
Note: If you are using this inner barrel for F10555 3D printed kit, you will need to sand down some parts of your kit.