The Sig Mosquito may be getting better but it is still made of Zamak,,,
That and it's iffy reputation for performance makes me leery,,,
Spend a little bit more money and get a better gun.
Sig makes a "Classic 22" on three of their models,,,
These are convertable up
to 9mm, 40 S&W, and .357 Sig using their X-Change Kit.
P-226 Classic 22
is one example,,,
This way you get a real pistol that is chambered for .22 LR.
If you are considering a CZ-75B Kadet,,,
You need to hurry and make your purchase,,,
CZ is discontinuing the complete pistol this year,,,
Soon you will only be able to buy the Kadet Adapter Kit.
I own the CZ-75B Kadet and can attest to it's fine performance,,,
I usually run CCI Mini Mags through the gun,,,
But it performs with Federal Bulk Pack too.
Just something else to consider.