Yes you can produce a nice quiet can on a form 1
go give this forum a try they are into actually designing the can prior to build one has to have a basic idea of length etc before approval
https://www.silencertalk.com/forum/viewforum.php?f=10
you will find some extremely helpful folks that do this for a hobby.
here is a sample of discussions
"Been testing a couple of designs and need verification of results, all using 9mm ammo on 11mm bores.
I've noticed that K baffles produce a higher pitch than M baffles (lower pitch) on the same lengthed bodies/tubes with same number of baffles.
Lower pitch seemed to sound quieter to my ear.
Amplitude of suppression didn't change much from K vs M baffles.
Length of the tube increasing did decrease amplitude / volume, provided baffle types and number are constant.
M baffles seemed to have better suppression over length, as the tubes got longer (tested 8, 10, and 12 inches). K baffles see, to have optimul suppression at 10in.
Can anyone else confirm if these observations seem accurate?
"
one member white russian is actually quite knowledagable as well as many others (capt. Link) quite a few have FFL's (type 7 manufacter) with a SOT (what many refer to as a class 3) so they are able to test cans legally at whim without a form 1 they list their builds on a monthly or semi annual report don't recall for sure on the type 7 end, and they pay a excise tax (trust me not cheaper than a form 1) with renewal annually, insurance, etc etc. form 1 or even form 4 is way cheaper.
Form 1 processing time is usually faster than form 4, just remember you cant bore out the baffles UNTIL YOU HAVE THE APPROVED FORM 1 IN HAND.... and i wouldn't have any componets until Form 1 was submitted ..