The thing that would be a safety catch on a 1911 released the “slide” which cocks the action on both the rearward and forward stroke.
The button that would be a mag release on a 1911 is a cross-bolt trigger-blocking safety catch.
The barrel assembly pivots up to load. Either a single pellet directly in the breech, or fill the tube above the barrel with BBs, when it will reload each time you cycle the cocking “slide”. As long as you keep the muzzle pointing upwards.
Does that help?