Yes I think there was some poor machine work on that pistol but every 1911 I have ever owned had rub marks on one area or another. Every Sig I have owned had wear marks from the slide in the aluminum frame rails. All my Glocks either pig nose or the RSA scratches the frame near the locking block.
"Without a rifle you are nothing, worthless, you are waiting for death, any minute, any second."
-- Aron Bielski