"Sapiens dicit: 'Ignoscere divinum est, sed noli pretium plenum pro pizza sero allata solvere.'" - Michelangelo
" La rose est sans pourquoi, elle fleurit parce qu’elle fleurit ; Elle n’a souci d’elle-même, ne demande pas si on la voit. » Angelus Silesius
"There are problems in this universe for which there are no answers." Paul Muad'dib
No. A detachable suppressor could be attached to a firearm, so you need a stamp for it. Only integral suppressors on air guns are non-NFA.
The Marauder marketing material keeps mentioning a "shrouded" barrel to make it super-quiet, so it's possible that's code for integrally suppressed.
.
-----------------------------------------
Not another dime.
Here are some that can be added.