The barrel on my Striker got loose. The barrel is a 22-250 sporter cut down to ~ 16.5", muzzle filed flat and bore chamfered with an RCBS "cricket". I got home after shooting and found the barrel loose. I've made over 100 barrel changes on the Striker, M10 and M12. I use synthetic motor oil on the barrel threads when changing barrels, and store barrels with this oil on and in the barrels. I never rush when changing barrels, won't allow anyone to talk to me then, and am very careful. I have no idea why this barrel loosened. I now have added a "barrel tight?" step to my every-5-shot gun/scope check.

joe b.