There are two things you can invest in that always seem to rise in value, gold and guns. Well why not invest in both? A Calguns.net member has a gold AR-15 for sale, OK it’s not really gold but it is pretty darn unique. All the aluminum parts on this AR-15 have been custom anodized gold. It’s made out of a Sun Devil billet upper and lower and has a 16″ 1/9 twist barrel. The asking price? $1500.