While most tutorials revolved around modeling require a complete model, the deletion of faces are necessary when creating an FPS weapon since one side will not be seen for the majority of the time.  Deleting certain faces add in lowering the poly count aiding in the FPS and overall poly count.  Creating a normal map and or using baked textures of a higher poly version helps to refine the overall look of the weapon itself.  Here is a low poly revolver without the higher poly portion but with the most essential parts deleted.

Animation

Working full-time, but although its been a while I have been working on indie projects and tuning in on rigging in Blender just finished a simple rig and plan on animating next. Best thing about rigging is that the basics of rigging are the same in whatever program you are using Maya, Max, XSI, Blender or any other programs. The rig has simple elbow IK and Knee targets should be good for animating.