Another afternoon with my fav...

That 77K looks to be a really nice set up with that peep sight. Did you have any problems with the rifle shooting to high and running out of adjustment clicks to lower the point of impact with the peep sight?

Others have mentioned this problem with peep sights on air rifles.

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Close to running out of room, however not a problem. Currently as set for 10meters, I have still have some room to adj for lower poa.

Williams offers two models of these peeps sights (see pic below I grabbed from AoA). The model ...AG-TK would definitely present a problem as you mentioned as it cannot goes as low (due to that bar at its base) as the model on my 77k (...GR-TK).

Correction... either will work. Doubled checked one on my 77k; its ...AG-TK. (That said, obviously ...GR-TK model will def give you a bit more room to adj lower if need, which I dont think you will.)