I bought a regular AA US then send it to Ratworks after a year of use. It has been regged, tuned, quick fill and accurate manometer added and rowan trigger installed as well. It shoots 5p 5 shots groups at 50 yards all day. 3 out of 5 pellets goes in to the same hole. 30% of the groups are single hole. Mine likes JSB exacts and AA fields. Tried two different weights of QYS and unfortunatelly they did not worked in my gun!