I can vouch for no 8 rounders in my Springfield 1911 A1 Full size. I have 10 eight round magazines (Ed Brown, Lone Star, and a few other manufactures) and on NONE of them will the slide lock back after last round is fired. Gunsmith told me there was not enough tension on spring to force follower to engage slide stop. Tried the mags on another Springfield and 2 of the 10 worked in that gun. IT"S 7 ROUNDERS FOR ME!!!!!