Chamber Gauge ?

[BRDHNTR]

Gents, just buy the dam brass gauge. It's short money and you will find yourselves using it from time to time and on your buddies guns too. It's short money

[Tom Hawkins]

As Phil stated, a gun evaluation kit is very helpful. I made this kit years ago when the components were considerably cheaper. It has saved many mistakes over the years. It can be carried in a pocket and is lightweight. I could have doubled my money many times over the years if I had wanted to. The contents are as follows;
1 Chamber gauge
2 Bore gauge
3 Bore light
4 Tape Measure
5 Magnifying Glass

This kit is used along with a list of pre established checks to help prevent mistakes. My son calls it my screw prevention kit.