Peep/aperture rear sight for a Weihrauch HW77K?

[MDriskill]

Presumably, with the FP-AG, the sight is adjusted with a screwdriver whereas with the FP-AG TK it is clearly via the adjustable knobs.

Rgds
A

Correct, but...a Wiliams quirk I forgot to mention is that the gib screw on the left of the sight body locks the adjustment bar to the base. If it's not snug, the whole bar is quite wobbly, so - even with finger knob adjusters - you still need a screwdriver (back in the day Williams offered a knurled finger knob for the gib screw - a natural adjunct for finger knob adjusters - but no more). And this screw's slot is a different size than the flush-screw adjusters.

Also note the two small slotted screws in the rear of the adjustment bar, which lock each adjuster screw, and the tiny allen-head grub screws in the FP series' clamping bar.

Thus, it takes this many tools to mount and adjust the FP-AG. The arrowed bit is the only one you can discard with finger knobs!