Maybe he actually said that he waxed the inside of his "forearms" and not "firearms"
That too would be odd for the most part. He mentioned barrel and wax filling in pores and smoothing out the barrel. Wax in pores would be burnt away right away . Odd I tell ya just odd. Many of us have waxed the inside of stocks for moisture protection. Oh well different chit for different chitheads I guess.