Years ago I worked one summer at a boat building company producing gel coat boat parts from moulds. As I/we were spraying in coloured gel coat, we always used FRP mould release wax.
Later on in life I built some FRP moulds to reproduce motorcycle FRP parts. Based on the summer I spent in the boat compamy I purchased FRP mould release wax to coat the moulds.
After using it a few times I thought "I'm not spraying coloured gel coat" and "This stuff looks just like floor paste wax"!
When I ran out of the mould release wax I decided to use floor paste wax as a test. The floor wax was just as good as the mould release wax.
Again, as mentioned above, I used to apply 2-4 light coats, basically depending on the shape of the part and how difficult I thought it would be to release.
A good quality, plain old floor paste wax (make sure there is no silicone) will work fine to coat an action/barrel.
Just curious.
A couple of responses have specified "no silicone"
Why is that?