What drop in barrel did you use and was there any accuracy improvement?
Jarvis was my first aftermarket barrel - my understanding was that he is no longer making the 10mm Glock barrels. It was 5.5" long and had about 80fps velocity increase and noticeable accuracy increase.
Bar-Sto semi-drop in was my second it was for a G40, had to mill it to fit. Velocity is about 80fps faster. Accuracy of stock barrel on the G40 was great, the bar-sto might be slightly better, but not much.
KKM was third and for a G20. Accuracy was better than stock, but not as good as Jarvis. Velocity increased but don't remember how much.
I have a Zev barrel for a competition G34 and velocity is slightly higher, accuracy was noticeably improved with cheaper ammo. The G34 stock barrel is the only Glock barrel I've ever had where out of the box accuracy was disappointing. Three inch groups at 9 yards with white box ammo was the norm. Zev brought that down to about 1.5" with cheap ammo. Match ammo shoots 1.25" or less at 9 yards offhand.
