Of course, but you would expect aa to have some sort of thin sleeve or something like that to aid it in and we'd hope that aa aren't just forcing them in. Btw it is more easily put in from the block end of the shroud than the baffle end. Its because of the lip inside the baffle end after the threads it makes it harder to keep the o rings in place. Are do what iv done and needle file the slots slightly wider on the aluminium support were the o rings sit and when the o rings are getting squashed into the tube it gives you a bit more to work with. But i agree with you post the barrel should be longer are similar to the ultimate sporter.