For some reason whenever I try to shoot single rounds out of my M1903, it seems extremely difficult... The bolt wont close completely, Feels like the extractor wont go over the cartridge rim. Why would this be? I thought the '03 was designed to be able to shoot single rounds with a full magazine, isnt that the whole reason for the cut-off switch? Ive even tried to get a little "firm" with it but im afraid to try too hard and break the extractor... When I shoot rounds from the magazine, it works flawlessly..