Spent about an hour this morning installing a Vortek kit and seal in my 177 TX200. Had a bad seal with crony numbers with 100 fps spread. What a delightfully easy rifle to work on! The kit seems to be working excellent. Literally after ten break in shots I shot 2 really good 25 yard 5 hot groups. The first under a nickel. The second group 4 were a ragged hole.