I guess there is three ways to get it done; one send it of to someone that offers this service, two do it yourself with a rattle can, three use a spray and bake product if you have access to an oven.
I am working on getting an oven for gun finishing.
I did do one of my first custom projects a 280AI, with Brownells Alumihyde spray cans in olive drab. The process I used was;
Polish barreled action with 220 grit.
Mount and bed a 20moa scope base, also pre sanded this part.
Wipe down with acetone, and wear clean gloves when handling
slide a .700" wood dowel in bolt way.
Slide a wood dowel into the muzzel brake and bumped up against the crown.
Apply 3 coats as per instructions, making sure no runs were preasent.
During the paint application I made a small both and used an electric fan heater which kept the temps around 100-110 degrees.
Let the paint fully cure before messing with the barreled action.
I can honestly say the finish turned out great and has been quite durable, with about 300 rounds down the gun and numerous cleanings The only place the paint shows wear is the inside of the ports and the sharp edges of the ports on the muzzle brake
. This is mostly due to the cleaning solevents puddleing in the brake during cleaning.
If you give it a try and find you don't like the results you can always strip it off.
I for one am waiting till I am set up to play with Cerakote.