I'm a little primitive (OK, maybe a lot!) as far as my gun vice goes. I just use a regular old vice. I made plywood liners for the jaws that rest on the screw. I glued 9OZ leather to the face of the plywood. I use it like that for all my shaping and it is solid as a rock.
Then, once I get the shape near to final dimensions, I lay a dish towel over the screw, and lay two more folded up towels between the jaws and over the corners of the vice (to prevent dings). With about an inch of towel to squeeze with, I can roll the gun any way I want, snug her back up and she is solid as can be. The towels also double as convenient places to wipe the blood off of my fingers when they don't listen.
For my second support point, I use one of those rollers that catches things coming off of a table saw. It is adjustable in height so I can set it wherever is comfortable. I've wrapped it in - yep, another towel.
Obviously, the secret to this method is to be the one who does the laundry.