It's simply not possible.

xD is true

I just realized that it is possible, for those who want to know they only have to download the mod "Black Mesa Weapon Props (Mod version)", Once they have it in their spawnlist Look for the props of the mod and put the second glock What it seems, in case you did not understand, put the mouse for 2 seconds above one of the glocks and when you see that one of those is called "W_glock_lh" Invoke that one and then look for the weapon that you want your character to use in the But before that make the glock invisible with the tool
color and then use the bonemerge tool to join them at 2 o'clock, Left Click always on the glock, not on the weapon you want and after that Join it to your character, it seems too much but it is only 3 steps xD.

Me acabo de dar cuenta que sí es posible, para los que quieran saber Solo tienen que descargarse el mod "Black Mesa Weapon Props (Mod version)", Una vez que lo tengan en su spawnlist Busquen los props del mod y pongan la segunda glock que parece, por si no entendieron pongan el mouse por 2 segundos arriba de una de las glocks y cuando vean que una de esas se llama "W_glock_lh" Invoquen esa y luego busquen el arma que quieren que use su personaje en la Pero antes de eso hagan invisible la glock con la herramienta
color y despues usen la herramienta bonemerge para juntarlas a las 2, Selecciónen Click Izquierdo siempre en la glock, no en el arma que desean y luego de eso Juntenla a su personaje, parece demasiado pero solo son 3 pasos xD.