Angel Custom G2 SUS304 Stainless Steel Precision 6.01mm Airsoft GBB Pistol Tightbore Inner Barrel (Length: 137mm KJW KP06)

"Nice barrel, improved the heck of accuracy in my kwa m9,
BUT! the only problem i have with this is the in side of the barrel was very dirty out of the box. i have used soap cleaning solvent and silicon oil and pads to clean it off but it looks like its stuck on there pretty good...

pro: almost no more flyers and improved accuracy! worth it

con: needs a really good cleaning before use

"Compared to the stock barrel, there is no noticeable difference aside from the improved material. Maybe the stock barrel is already bored at 6.01mm.