It is more accurate than the stock barrel. A lot bigger than I expected. It doesn't fit flush at all, it isn't noticeable unless you try to find where it doesn't line up but it still bothers me since I inspected it. You will need Allen keys to adjust the sight. Other then that it shoots well and is decently accurate for those smaller fields.
If your going for the AK style gun, then it's a must have. Otherwise don't spend your money because your not going to get the performance you expected when searching for an accurate gun.