I will be honest, submitting this as a critique looks like more work than I can handle atm so here goes :
It looks like your trigger guard clips the foam in the case, I might be wrong, but unless its a tiny trigger guard, it looks wrong
Your magwell is perfectly "cubic" (AKA it's flat), this would not work in a real gun, since the magazine would get stuck, the gun would be uncomfortable to hold, and it would ruin the case.
Other than that, it looks like most details are in order, I don't know enough about the 1911 to know whether you can actually cock it without a magazine in it, but I doubt that it is possible.
It would be better visually if the indentation/curve/whatever at the front of the barrel stopped before hitting the lower body of the gun.
Maybe add some visual cues that the gun has been used?
IE : you might want to work on your textures, adding grime and dirt can be incredibly satisfying, and add a LOT to realism, scratches on the magazines where they would hit the side of the magwell, scratches on the magwell,holes/indentations in the foam (unavoidable in real life), +maybe a bump map or two on the floor+the steel part of the case that is visible to the viewer..
The modeling looks good, can't really find any glaring faults, so keep plugging