Tom West https://urgthrash.wixsite.com/squirrelmaster - a decent stock (better than anything I can make) but not as high quality as the next two I listed below but much nicer than the plastic 1399 stock you get with the Prod. He offers different type woods. Mine is walnut and I like it. I have a Tom West stock on my 1720T as well.
Rink-Formgriffe https://www.formgriffe.de/en/Shoulder-stocks/ - another quality made stock. Make sure you get it with the adjustable cheek riser. It will be too low otherwise. I like mine a lot. The forearm on mine is not made by Rink. I got that piece on eBay a couple years ago. I believe it’s made in Germany.
Opinions offered without firsthand knowledge or experience, are not only invalid, but irrelevant. As the owner of three of the options I listed, I can say, without a doubt, that the Manop stock, at a near equivalent cost to my Tom West stock, is hands down, the better balance of price, fit, finish and function that I’ve experienced so far. Caveat emptor