Laser sight for a Glock 19, it has a short rail in front of trigger. Cost limit $150.
Night vision scope for an AR15 5.56 for out to 300 yards or so. Price limit $1000.
Best sight for Baretta 1301 shot gun. 12 Ga
Are reflex sights good for pistols and shotguns?
There is no sub-1000 NV solution for the AR that won't light you up like a Christmas tree for anyone else with NV.
At that budget, I'd drop an aimpoint T2 on there, a good weaponlight, and call it a day.
Ditto the Glock. Your quality white light/laser combos just aren't available in that price range. Just get some tritium dots and a white light, and learn to use your sights. Honestly, the main purpose of a laser on the rail is just to track movement to detect flinches and during dry fire. They don't make much sense tactically.
Shotgun -- red dot can work, or just a good ghost ring sight with a tritium front post (optional honestly)... and put a good white light on it (seeing a pattern here?)