I used to have a 12 ga in my golf bag. 18"bbl Mossberg. Put a condom over the muzzle to keep stuff out of the bore and put it muzzle down in the bag. Covered the butt with a ski hat that had a large tassle on it. Looked like a golf club cover and I could just grab the tassle to remove it. Makes the bag a little heavy but that's what carts are for.