More recently, there was a decade or so of griping about how laser sights on handguns could never work. They’re electronic, and therefore prone to ill-tempered behavior, they would certainly break the minute they left the store, and the batteries would run dry at the worst possible moment 119% of the time and they're huge! Yet, here we are. You can hammer nails into a railroad tie with many of today's lasers, and I know a few rifle scopes that could do the job too. They’ve become a normal and accepted piece of gear, even by Delta Ninja Seal Operator types—and they're pretty serious about reliability.