I have rails on most of my centrefire rifles. As I see it there is one less part than with two separate bases and the one piece means it is less likely to move, which would cause it to loosen when a torque is applied. I only have one with a drop box mag and very rarely do I fill the magazine by removing it, I mainly top load. The only one I don't have a rail on is the one I mainly feed from the magazine and it has a blind mag so gets top fed too anyway. Now I am have a couple with a canted rail, just for when I'm able to shoot a little further.
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