About 6 years ago I purchased a Ruger Mark II stainless .22. Which I have shot a lot. By a lot I mean probably over 10,000 rounds through it. I purchased a flexible LED flashlight from Harbor Freight and when I shown the light down the barrel I couldn't see any lands or grooves. Does this mean that I have shot the barrel out? I clean the gun after every outing but I never payed attention to the lands and grooves until now.