ZCI 6.02mm Stainless Steel Precision Tight Bore AEG Inner Barrel (Length: 229mm)

"Not the greatest. I got this when I didn’t know any better a couple years ago and stuck it in my m14. Had worse accuracy than the stock barrel. Now that I’ve been a tech, I know better that you can’t go with a bore smaller than 6.03mm (like 6.02mm or 6.01mm) for a barrel over 300mm. Only get a 6.02mm or 6.01mm if your inner barrel is shorter than 300mm. Regardless, these barrels aren’t great even at shorter lengths. There are better barrels for only a little more cash.