I have a silver "A1 Optics" Red Dot, lying here on My computer desk. They would probably be fine for a .22, up to perhaps even a .357. But, they are definitely not up to a .44 Mag. I put this one on My .44, & without "any" adjustment it hit dead center at 35 Yds !! 3 times, it cut the same hole "cloverleafed ! & then on the third shot, the front lense turned to "powdered glass". So, here it lays, yet. That was last spring, & this spring at the Harrisburg Show, I bought a "Millett".