The Newer Avengers use a threaded plastic shroud adapter which the shroud screws onto. The stock plastic mount is weak and prone to breaking if over tightened which means you cannot tighten it down adequately. This can lead to the shroud being able to move around a bit which will affect accuracy. This high quality adapter will fix those issue and create a more consistent shooting airgun. Or just replace a broken or damaged shroud mount.
The AE Swede adapter is CNC machined from 7075 high strength aluminum part and utilizes two set screws. You can clock the piece however you want and does not need the stock barrel indents to lock in place. This helps when holes have been drilled in the shroud at the rear for extra sound deadening ability.