The scope body is identical to the ones we sell for 5.66 NATO, 7.62x39, etc. so parallax is set at 100 yards just like on those. Honestly at such low magnification parallax error isn’t usually a big deal at all, the only guys I see who really want adjustable parallax on a .22lr are the rimfire precision competition folks, and I recommend the 4-14x44 ARC-2 MOA for that application.
The center dot is really small, 1 MOA or just 1.047 inches at 100 yards. For fast shooting up close like 25 yards just hold that thick horse shoe on the target and let ‘er rip. Devastating on plate racks and clay pigeons, super fast.