Ok. Im getting a little lost here. So lets start from the beginning.
What you need for player weapon.
1. Some folders in the gamcore/guns/. Make a "user" folder and then make a "glock" folder in there. So you end up with gamecore/guns/user/glock.
2. What you need in the glock folder:
a)HUD.x - This is the player weapon
b)VWEAP.x - This is the enemy weapon
c)Textures for the gun
d)gunspec.txt - This is for the guns specifications and parameters.
Easy quick way is to copy the contents of the "Colt" and paste them to the Glock folder and replace/edit those 4 items above.
Once you have that, run fpsc, open/create a map, assign the glock to the player marker and test. If you can't see the gun, make sure the alignment is correct in max (re: pic above)
Oh! I forgot...ooops sorry. I'm using the Pandasoft exporter for max. That might make a difference. I don't have the link on hand, google it. For export settings you can use the same one as characters. Link to online guide is on the download page on the fpsc website.
good luck