Lex is admittedly one of those people looking at weapons as collectibles, but it is also in conjunction with how well the weapon still functions. He is doing his best to recreate his home from before Baedal where the walls are littered with close range combat weapons and various guns are kept in more hidden areas. One of the many lessons Lex was taught growing up was that "you're not a Luthor unless someone is trying to kill you." He couldn't yet tell if that were true here, but it didn't hurt to be prepared.

When he sees the woman in the shop also looking at arms he notices that she hadn't exactly arrived empty handed. "Excuse me," he says by way of getting her attention. "May I ask for your advice?"