This mod from Woly replaces the Colt.45 with a Glock 17.
You will need IMGTOOL 2.0 to install this mod. Open your gta3.img file using IMGTOOL.
Replace colt45.dff with the one located in the zip file. Replace the colt45.txd
with the one you want from one of the folders located within the zip file.
This is not fully my creation, the original model was by MGSV, I just tweaked and textured it.
Enjoy ~ Woly