https://www.thefirearmblog.com...er-from-b-t-44815951

The comparison to the Rotex is a bit stupid, considering the larger silencer's sound performance would be much better.

Also, I believe there are better ways to mount a can to the 550. The "Halo"-style mount mechanism works on these guns. You could even retain the reflex functionality by having the collar tighten on the grenade ring, as opposed to the flash hider shoulder.

Wow, that is a monster! Interesting mounting system. You can special order the Rotex can from B&T USA for the 550 but I decided the gun is long enough without a can.

Forgotten weapons has a nice piece on the history of B&T suppressors including this one...