The rear sight of the Rascal is adjustable for up/down and the front sight is dove-tailed for left/right.
The rear sight pivots round the front screw and you adjust the sight up/down and tighten the rear screw to secure it.
I was using Armscor .22LR ammo and shooting from the prone position.
It is worth your time to improvise some shims. This is not something you can eyeball. I used 3 x 5" index cards and was able to move the point-of-impact up-or-down in incremental jumps.
It took 14 3 x 5" cards and one 3 x 5" insert made from copy paper to get a reasonable (but not perfect) zero at 20 paces. That measured out to 0.108" thick.
I am still 3/8" high at 20 yards but the sight is fussy and I am not sure that I am going to get much closer than that. I cannot imagine that a woodchuck or rabbit will notice that 3/8" difference at any range I am likely to attempt a shot.
***Added later: I accessed an on-line ballistics calculator to see what the trajectory is likely to be farther down-range. Because the top of the front sight is only 0.75" above the center-of-bore, the "second zero" is closer than I expected. The second zero is at 50 yards and the bullet drops to about -1.0 inch below line-of-sight by 60 yards.***
The front sight did not require any adjustment.
Every rifle and every shooter is slightly different. The shim-pack that worked for me is no more than a good starting point for the next guy or gal. It should be good enough to "get you on the paper" as you dial in.
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