I bought one of these recoil triggers from Germany. The guy is make copies or the original from USA with the owners permission.
I found out about them on Facebook Labrador owners group. Delivery was 4 days and in total cost around 45 euros. Here's the link to the post
https://www.facebook.com/groups/2121379321415302/permalink/2617353658484530/
Unfortunately I have not been able to test it yet due to the shooting restrictions. But all the feedback I've found has been superb.