Great product - SightMark Triple Duty Universal Laser Bore Sight

Retired 74 Y/O law enforcement officer. Been hunting, fishing, shooting, camping in Colorado my whole life. LOTS of shooting. Prefer old military guns and open sights. But even original sights can be off. And use scopes for big game for clean, one-shot kills. Have tried a lot of bore sighters. This is my second SightMark. Their products are the best and most accurate. Not sure why they call this a Triple Duty, but it is bright and easy to use. Got rid of all my other bore sighters and use this one exclusively. From 22 to 5.56 to 458 Win Mag. This has always got me very close to the "X" on the target with the first shot.