Just in case anyone was wanting some used Sigma 9mm 16s, Mark at Summit Gun Broker still has them for $25 each. I forgot how much S&H was over a year ago when I got a few but it wasn't much and was the same regardless of the number you ordered. The 3 I got were pre-ban LE-only, great condition w/ lime green followers lol. All are still going strong today, I just polished them up a bit to make them sparkle. I may have actually gotten the tip on this board, too. .40s are the same price.
Here's the post I mentioned them in:
SD9VE, from gritty trigger to broken striker