If you're referring to the defacing of the spacer, they all do that, spacers are cheap to replace, less than $4, or you can buy a metal spacer and trigger guard for about $75, or $40 each...I've been experimenting with beeswax on the spacer to make a tight action open smoother and lubricate it, but nothing definitive yet. Oil is too messy, silicone might work, too. Doesn't seem to affect accuracy, either.
Tim