Seemed every 3 or 4 or 6 shots I had a flier and with a different arrow that was good before, Then I noticed a wear spot on the rail just about center. I cocked the bow and put a straight edge on it and it rocked about 1/16 of an inch. Put 4 arrows in an all moved very badly where the tip was, They were well off the rail Some arrows are bent so the real test was the straight edge. No problem from Parker, Gettin a new one. Stant