WHAT DOES DIAMONDBACK DB15 CHARGING HANDLES MEAN?

I re-loaded the magazine, slid it into location, pulled the slide again and Permit it go into battery. Refreshing my sight picture, I labored previous the resistance and the very first round struck the goal low and still left of Centre.May be the scope however lead to it used to not be like that. Even about the 40mm I just want to be sure I can see