F2.2. An ‘F’ Class Open rifle may be of any calibre up to and including 8mm and the overall
weight must not exceed 10kg including all attachments (such as, but not limited to, its sights
and bipod, if any). NB: An ‘attachment’ is defined as including any external object (other
than the competitor, his sling (if any) and his apparel) which recoils (or partially recoils)
with the rifle, or which is clamped, magnetically or viscously held, or in any other way
joined to the rifle for each shot, or which even slightly rises with the rifle when vertically
lifting the latter from its rest(s).