I'm just speculating when I say possible improves, I have nothing concrete. Just going off things I've read to my own experience. Some say the notos isn't that loud, it's the quietest 20 fpe gun I've ever heard. Not joking. I've had Niel Clague, DonnyFL, Mrod shroud setups with 10 baffles, and my 10 baffled hatsan flashpup. The pup was the closest, but this is still quieter. Both report and mainly the action.
It's a bit louder shooting the 14 grains vs the 21s I'm using, but I want a quiet hammer. I'm thinking about trying polymags to even further the energy dumps at 20-30 yards, but the report will surely go up with the velocity boost of 5 grains lighter ammo.
As for the trigger, I don't feel any grit or course spots, just a heavy break but predictable. I read a few posts when they first came out that they were gritty triggers. Wobble is non existent when the sear is locked up, just a bit of wobble when it's not cocked.
I would think since they were sold out for a few months, that anything you get now would be second batch.
They might be exactly the same, and I'm not being critical like everyone else was with these things. I dunno, but get one, they're a blast and worth more than you'll be paying. I've considered a second to push it to higher power amongst other mods. This one is on side door guard duty, sitting in the garage.
It sounds quieter than the OEM and that's good enough for me!