Engraved Colt Single Action Army - This engraved Colt Single Action Army revolver from the Petersen Gallery makes at least one member of our museum staff feel like he’s back in the Big Horn Mountains of Wyoming. Up nearly two miles high, you can see elk like the inlaid gold example on this revolver’s cylinder bugling next to crystal clear streams. An ivory-gripped Colt like this one might be just the choice for a memento of a favorite hunting trip. NRA National Firearms Museum in Fairfax, VA.