I appreciate the response! I watched a couple of Youtube vids on this particular issue. Apparently, I'm not the only one (imagine that)! One vid suggested switching to Wilson Combat mags (at $50 each), the other vid was a gunsmith that actually diagnosed the problem that the slide lock lug is not making sufficient contact to the mag due to a cheap cast part used by Springfield. His suggestion was to buy a $20 slide stop from Wilson Combat to replace the factory POS part. I am going to look the 1911 over closely tonight and I will probably go with replacing the slide stop first to see if that helps.