ZCI's latest generation of 6.02mm inner barrel's are great quality for the price. Made from stainless steel these tightbore inner barrels help to improve accuracy and velocity due to a tighter bore and better internal finish.   ZCI make one of the best aftermarket 'budget' barrels and have some great features such as deep crowns and double alignment slots so they can fit both normal and TM M14 style hopups. As with all aftermarket barrels please clean inside thoroughly.  

Specifications
Length: 400mm
Bore: 6.02mm
Material: Stainless Steel