You might forget the technical stuff like how many mm a 18.5 inch barrel is but you don't forget the basics like not leaving loaded firearms unattended where curious kids are playing or muzzle control (not pointing guns at people).
You might forget the technical stuff like how many mm a 18.5 inch barrel is but you don't forget the basics like not leaving loaded firearms unattended where curious kids are playing or muzzle control (not pointing guns at people).