Even if you had enough voltage, the CR123 cannot handle the current desired (about 3 amps) for a WA1185. Anything more than about 1.5 amps is going to be difficult for that cell.
5X123 @ WA1185 works. It's very hard on the 123s. They die in about 20 minutes. That's $18.00/$19.25 per hour. OK for short "Who is that!" bursts. So, wasBlinded and UncleFester are both correct I believe.
So, with knowing about that, knowing about the PM6 cannon and knowing 5X123 against a WA1185 is 35 to 40 watts; this may be not such a good idea at all.