To repair it would take the work of some one skilled with welding aluminum. Its not hard and a lot of guys can do it, but to do a good job is another story. Where most guys fail is in surface prep aluminum has to be clean and I mean real clean or you end up with a bad weld. Refinishing would be required but with so many options out there is relay quite easy. Heat treating is a non issue in this case due to the parts intended purpose.
If It were mine I would grind out a small area and fill it back in with weld. But if it is not effecting anything best leave it be. If it really bothers you hit it with some sand paper to flatten it out and add Krylon. Painted guns look better anyhow.
"After I shot myself, my training took over and I called my parents..." Texas Grebner
"Take me with a grain of salt, my sarcasm does not relate well over the internet"
Jonathan Morehouse
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