I don't know. I'm still shooting it stock. I'm going to hold out awhile and see if it'll hold together in the stock 16 FPE tune with some more loctite and patience."dr_beretta"Thanks for the tip Smaug. I tend to check all screws after each shooting session and tighten them up if needed. I used blue loctite on all the screws prior to shooting it. At least I'll know what to look for should accuracy suddenly change on me. So I'm guessing the gun's pellet of choice changes when you change to a Vortek Kit?