Put the sling through the butt swivel and utilize "U.S." style! (Can detach the rear or just loosen enough not to interfere whilst shooting "slung up".) The mid swivel option is just that w/ the M1907 sling- an option. Its super handy when using the Britishicon style web sling, though. I like the web sling better, in fact, when utilizing the mid swivel.