Question four: How did you model those parts of the gun? See PIC9 Alright... as you probably all know, the boolean operations in MAX are really, really bad. NEVER ever use boolean operations if you want a clean mesh! I actually use boolean operations sometimes if I want an old-looking, distorted shape and want to save time ;-) I´m not joking! You see those belts around the hunters waist/hip? Those are simple boxes which have been created by the "intersection"-boolean operation together with a copy of the torso! They´ve been scaled and extruded afterwards. Looks really unregular, doesn´t it? ;-)

Booleans in Max are crap. It´s as simple as that. Unless you´ve got this expensive program called power-boolean, leave it.
So if you want circular-shaped holes in your model, you need to be creative...

You don´t have too many possibilitys! I know exactly three of them:
1. Go to editably-poly mode, select a square (!!!) poly, extrude it inwards, smooth it.
You´ll end up with a circular-shaped hole.
2. Use the shape-merge compound-object, shape-merge a circle on your object and extrude this shape inwards. DO NOT smooth afterwards!
3. Use shapes right from the start and extrude those shapes. That´s how I did those holes here.

See the following pics for further explanation:

PIC10: Draw your basic shape, use splines.