You are welcome!
The 511 is one CZ I know very little about. Try RimfireCentral, which has an outstanding CZ forum - they can probably be of help. I especially recommend GMD1950 (Gerald), a 511 owner who posts on his various experiments with it. There are others, but he would be my first contact.
Hope this helps.
My 511 has the tumbling triangular 50m/100m rear sight. I don't belive the J&G aperature sight will work without the sight ladder rear sight??? Also, my 511 came with (2) 8 round mags. I wanted to buy some extra but they have been pulled from Midway USA "manufacturer has discontinued"
I went to the CZ Czech site and place an order for 3. Not cheap with euro conversion or shipping cost. Hope there is no problem clearing customs.
Separate names with a comma.