I attached a small chain to mine, that was 15 feet long that way I had the same distance from muzzle to measurement each time.
I found that some people cant read a tape measure!
Found some key chain that was 15 feet lone at Home depot so I used it.
Failure is part of success!
This year will go down in history. For the first time, a civilized nation has full gun registration. Our streets will be safer, our police more efficient, and the world will follow our lead into the future!" -Adolf Hitler,1935"