They're cheap crap. If you're putting it on a .22 it may hold zero. I had one on an SKS and it held zero for about 75 rounds.
Look at Primary Arms website for some very decent red dots and 1-4x variable scopes in the sub $250 range. They carry their own house brand which ain't bad at all as well as Millet, Nikon, Vortex, on up to the expensive big name brands like NightForce and Leupold.