What is the name of that guy (PvtRyan?) that was building his own custom Sistemas? He had a web page up tracking it, etc. IIRC he mentioned something about the Sistemas being a softer metal and easier to work with. Seems like he put a lot of research into his project and this issue didn't bother him re: long term durability.
I was just curious and fishing for more info as $300 1911's in this good of condition would be very tempting.
BTW, great looking pistola!