looks interesting , however not an easy mod :
"This is not a simple job for DIY gunsmiths, and unless you are skilled in these things I wouldn't advise you try this.
The whole top slide has to be taken off the gun and dissembled. The metal pivot supports are removed and then the barrel is removed by undoing the four screws on the retaining blocks.
To fit an adapter the top slide then needs to be bored out at the muzzle, the barrel muzzle turned down to a spigot and re-crowned, then a concealed grub screw tapping is made to retain the adapter piece.
This mod will give you nearly a full foot pound of extra muzzle energy, everything else remaining exactly the same, so it is imperative the gun is carefully adjusted for power output afterwards.
The extra pneumatic efficiency will mean that you get nearly full power on just two pumps, and this is a very effective mod, balancing the gun nicely, with good aesthetics and the gun becomes very quiet on discharge."
Her is the same mod with Hatsan silencer attached
I'm sure there are some magicians around this forum that can accomplish something like this ?
I even noticed the case my Alecto came in , has room for an extended barrel.
Alecto has brought out the "Ultra" , bit with the moderator mod I think this pistol will be even more quiet...