Buddy from Germany sent me a gift since it's tangentially related to the SKS. It's an East German bayonet trainer designed after the form of an SKS and AK mix.
(https://i.ibb.co/tMMGXtyS/20250611-163629.jpg) (https://ibb.co/SXXjr8q2)
There is one on ebay right now.
https://ebay.us/m/xstkRx
That's pretty cool. There's no sling or bayo on the ebay rifle, PAX
That is cool 8) The eBay example is missing the spring-loaded (?) “practice-bayonet” attachment too. Yours looks complete.
There's not much info on these, but luckily a polish buddy of mine has a book (in polish) that mentions it. He said he'll translate it when he's able to and I'll share it here when he does.