Here’s my first impressions on the 509.
Roughly comparable in size and shoot-ability to a G19. That’s a good thing.
Trigger is a little gritty on take up especially, but with a very nice reset. Didn’t notice it while shooting. Several friends who have one have said that it smooths out with use. Apex also offers a replacement. I wouldn’t complain about it for my personal gun, but it’s worth mentioning for the trigger snobs.
Sights are the stock 3 dots, which I don’t care for; I’d like an orange front with blacked out rear, if I can’t just have a red dot. 🙂 I shot it almost as well as I can shoot with an RMR, so it’s not a big complain on the accuracy front, it’s just slower acquiring them when shooting fast. This was at 7 yards, at a moderate pace, offhand.
In its stock form: 3.8 out of 5. Would carry. Holsters available here.