Here’s a cool old commercial blast from the past for a toy set that you won’t be able to find in stores these days: the Tommy Burst Detective Set.
In addition to the Tommy Burst is a nifty toy Thompson submachine gun. Like the Thompson, it fires from an open bolt (kind of) and fires a burst of shots. It also offers select-fire so you can shoot one shot at a time, if you prefer. Heck, it even has folding sights!
You can also get a snub-nose revolver that fires caps and safe-shootin’ bullets, and it comes with a shoulder holster that retains the handgun well, yet allows you to pull the gun for a fast draw.