That is a beautiful paint job and an amazing gun if u buy it please bring it to AZ and we will go gun crazy haha im not even 21 and i have 3 hand guns picked out to purchase haha but 50-100 rounds through that thing in one sitting and u wont have a shoulder!
as far as the paint goes if it is a Acrylic Enamel without Catalyst the heat will only make the paint harden more as it gets hotter. Acrylic Enamel without Catalyst is recommended for painting engine blocks and engine bays due to its ability to stand up to heat