I have the Crown in 25 caliber. It shoots both the mark 1&2 well .5” at 50 .75” at 100 and 1.25” at 150. From what I understand you need a different outer barrel/ Moderator for each caliber I’m actually also thinking of getting a Impact but not until it’s made available with the x barrel as standard. Hopefully the Crown and Impact Barrel will be interchangeable. The Crown is sweet off a bench I’ve used it for 5 hours sessions without it being uncomfortable. My 2 bullpups (Gladius and Matador) aren’t as comfortable. I have a single shot tray for the crown that Ernest was kind enough to send me before he went to work for FX. I’m also interested in getting a 30 x barrel for my Crown in 700 mm if the come out with it. It might be more interesting to see if the FX x barrel liners can be adapted to othe rifles as well.