Ordered a drop-in jarvis barrel for my Q5. When i recieved it ,shot 100 rds through it but wasn't happy with results. Contacted Jarvis and explained the problem i was having. He insisted he wanted me to be satified,told me to ship barrel back with my slide included and he would make me another barrel and he would fit it personally. I was very impressed with the customer service. Received the new fitted barrel and all I can say is WOW!!!!. The accuracy was incredible. Any shots from 3 to 10 yards were in 3/4 in groups ,15 to 25 yard groups were no greater than 1 1/2 in groups.This was with FMJ ammo, with expensive 125 hollow points I could get 15 yd shots to less than an 1 in groups.Sot over 500 rds with no malfunctions. If you want accuracy get a fitted Jarvis barrel.