Found it in the back of my parts drawer and just can't remember what it came from :(
thanks for you help and suggestions
Shotgun Breech bolt lock, not sure make and model.
I "think" it's a broken Charles Daly 300 pump
Once again thank you my friend ☺☺☺
That must have been a common problem on those Turk 870 clones, because I see a lot of new replacements for sale. Akkar? was the maker for Daly.