That's an actual sentry gun, so the existing targeting code handles it. There was no map-side stuff done aside from parenting the laser pointer to the sentry to make it more obvious.
Sorry to derail a bit, but on the topic of lasers, ABS, is there a way to make a moving laser that goes out until it hits a brush and stops? As in, it's length is changing based on when it hits. I'm probably missing something super-obvious here...
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