Posting this so that hopefully no one makes the same mistake I did. When you finally get the old brake off and press the new one on, index the FSB by shooting the gun it first, before you drill it out for the pins. When I initially installed the brake, I indexed it by making the ears on the FSB level with the rear sight leaf (which is a common way of doing it, apparently). As it turns out, the left ear on mine is*slightly* higher than the right, so when I used that as a guide, the FSB slightly canted to the left. It wasn't noticeable to look at it, but when sighted in, the sight post had to be