I use an old Lohman site vise. I don’t think they are still made under that brand name but there are similar devices on Amazon. Why? Small, portable, and easy to use on a kitchen counter.
Several years ago I made one with some scrap I had in the garage. The top is hinged and has storage underneath. Had I to do over again, I would have done some things differently, but I'm happy with it for what it is. It's good for cleaning and minor tinkering.
You vise looks very nicely done! Could you let us in on what you would do differently?
In my opinion if it is made out of plastic it is a gun stand not a gun vise. I use a pair of woodworking vises mounted fairly close together on my bench for any serious work on rifles.