Decent low end red dot/reflex sights
 

I have a Ruger 22/45 Mk.3, 5.5" bull barrel 0.22LR target pistol & I'm wondering if there are any decent red dot/reflex/holographic sights or scopes for $50 or less ? thanks.

That's kind of a low budget. Your limited to UTG, Tru-Glow, Bersa, and other Chineese maid optics. The next step up us the Bushnell TRS-25. I've seen itgo for as low as $69 if you shop around,