Just a quick note to all who mentioned parts availability problems. I've been able to buy two Sigma sear groups direct from S&W. The second time, the person on the phone told me they don't sell those parts direct, but relented when I told him they'd sold me one a month before and asked what had changed. At any rate, Midway USA does now stock the sear group, for not a lot more than S&W charges. They were in stock a few days ago. Brownell's lists them, but currently shows them out of stock.