Hello and thank you for your post.
I live in Florida USA and there is no registration or restriction on such a conversion kit, They are gun parts.
50 Euros (70 dollars) is a very good deal as the 45 to 22 1911 conversion kits are closer to $150 to $200 here in the USA.
I would love to have a kit like this and will be investigating finding one now that I know they exist.
From what little research I have done so far it appears that they do not export them to the USA.
Just found this link
http://www.lothar-walther.de/200.php
The conversion set is very interesting because although conversion kits for semi auto Colt 1911 style handguns are very popular here revolver kits that include a barrel are non existant.
Up until today I have only seen drop in chamber inserts but without the rifled barrel which results in the bullet exiting without spinning.
End result is innaccuracy.
I realize you said you have not purchased the set yet but may I ask a few questions?
It occurrs to me that the 22 is a rimfire cartridge and the firing pin needs to strike the cartridge on its edge.
Are the cylinder inserts offset to allow the firing pin to strike off center?
If not what prevents the firing pin from striking the .22lr cartridge at its center?
If they are offset how does one align the barrel and offset inserts and what prevents the inserts from rotating out of alignment in the cylinder?
From the photgraph it appears like each insert has some sort of spring clip to prevent rotation once inserted?
Why does one cylinder insert look different than the rest?
Do you know the installation procedure?
I am guessing the barrel inserts from the muzzle then a bushing slips over it centering it in the barrel breech with the threaded knurled brass nut at the muzzle pulling it together tight?
If you do buy the kit would you mind posting a few more pictures especially of the cylinder chamber inserts from the back?
BTW,
Another European posted a question with pictures of a 22 conversion kit for a S&W Model 39 last week,
Thats another kit we dont see here in the USA.
Thank you for the post
Best regards