didn't try it out in Source in the end, couldn't figure out why the plugins went missing

anyway, i took a few snap shots of an altered glock

take note that you should delete edges that don't change the shape of the model

you have to do this stuff manually

its a tough and long job ahead for you, but that's because you beveled your edges TOO much
i'd start over if i were you...

you'll notice in my attached picture in the lower left screen shot there are some selected edges. why do you even have them there in the first place? i assume its an accident of another operation you did somewhere else?
i only did a few changes (deleted edges mainly, i did add edges to the side of the gun as you can see in the top left screen shot)
it could be cleaned up a lot more than what i've done too


also, a tip for game models... if you can texture it then texture it.

also, the poly count after my changes was only 5499, you're was 6259, and that was just making changes on one HALF of the gun... imagine what would happen when you do the same to the other half