Installed their sear in my M&P 9FS not too long ago and it made a big improvement. They finally came out with their own striker block and I installed it last night. WOW what a difference!! One of the main complaints about the M&P triggers I've read is that the trigger is gritty. Well, even if you don't want to mess with replacing the sear (even though it takes maybe 10 minutes) but you hate the grittiness of the long trigger pull, you should definitely buy one of their striker blocks. The reset is a little more noticeable now and the pull is extremely smooth. It's also nice that they aren't very expensive upgrades. Thumbs up to Apex Tactical!