Welcome! Since no one answered your last question - if you see the 63086 stamped on various area (right lower side of grip frame, yoke arm, etc.) it is called an assembly number, assigned to keep major components of the gun together though the production process. After it leaves the factory the only significance is you know all the parts are original.
"1st shot out of the barrel was dead center of the target! Anyone want a Glock 23?"
Try to keep the secret from coming out or everyone will want one
. Enjoy!