Steve Dobos, the owner of Texas-based fabricated and machined metal products company Butler Weldments, has been receiving a lot of calls recently. On the other end of the line are private-equity firms, which are increasingly seeing the submarine industrial base as an attractive investment due to its stability and high barrier of entry. “It's certainly a high-growth potential for a private-equity firm,” Dobos said in an interview with Inside Defense . “Speaking from my company itself, I get interest all...