Get a Huggett, either a Bellitta or Atom, depending on how how long you want the barrel. The Atom is 3" long and 1.22" diameter, Belitta is closer to 5". Both are Pfffffft quiet.
I was able to get an extra magazine for my atomic xr from Airguns of Arizona. It wasnt on their website so I emailed them and they had it in stock. Not sure if the concept uses the same mag.
I have the huggett atom. Its a nice moderator and does the job great for my atomic. Its a smaller moderator so it doesn’t dampen nose as much as a 5”.
Another vote for CARM mags. Slow to ship to the US but well worth the wait.
PM Rocker1 on the GTA forum. He makes awesome moderators at half the cost of the “name brand” ones and they have done very well in independent testing in silencing and weight comparisons.