I have owned this G19 for about 6 months and several months ago I had a Jarvis barrel fitted. Accuracy improved a little but I wasn't very impressed. I ordered a Bar Sto drop in and it fit well. I went to the range this morning to try it and was very suprised. Much improvement in accuracy and reliability was 100% with Ga Arms 124gr FMJ and JHP+P.Accuracy is now about 2in at 25 yards.Bottom line - For sale 1 Jarvis fitted barrel for Glock 19!