"First off, I bought this barrel for my aftermath kraken AK47. I installed it myself just a few moments ago with hardly any problems. From what I have observed (only shot in front yard so far) the accuracy is very good. The grouping is especially good. I was hitting a 12inch by 4inch sight from 105feet away, one right after the other. Then i shot at a tree from 160ft away and hit it no problem. This is before I even adjusted my hop up! Over all i give this a 4 stars just because I have only used it once and have not seen the full potential of this simple but effective upgrade."