I have a M11/9 and I like the Lage upper options all though I don't have one yet. I have a chance to buy either another M11/9 or MAC10/9 and am wondering about the difference in reliability, parts and mag availability between the two. My M11/9 is new in the box so I'm hesitant to shoot it that's why I'm considering one of the other guns since both of them have been shot. I should probably get the M11/9 so all parts,mags will work in both guns, but that old Ingram sure is nice. I picked up the MAC MAN book last week and it is a must have, great book.