Quote Originally Posted by Rustam Bana View Post
I too have reverted to open sights and would also like to use a diopter sight.

Which model of the Williams/Beeman diopter sight do I order for the HW 80K and 77K?

A friend ordered a Williams diopter for his 77K but it fouled with his stock, if I recall.

Thanks.
I use this one on my HW 95's and 99. Others will advise if it will fit the models you mention. Igot mine through the Bay direct from U.S., it cost approx £35 inc. delivery.
hth
Jim
https://williamsgunsight.com/product/williams-5d-ag/