Inexpensive red dots, like the BSA, are an attractive option but you will probably find that their limitations make them less than satisfactory sights.
The BSA's have too much parallax and you MUST line up your eye in precisely the same place each time to get satisfactory accuracy. I will accept that accuracy is less important with a shotgun but I have always felt that the sights need to be dependable and I don't think these make the grade.
I use an M-68 AimPoint on my flat-top AR and it's great. No parallax or at least so little that its not apparent. As long as the red dot is on the target, your shot will hit it and the position of your eye to the sight or the position of the dot in the field of view make no difference whatsoever.
I'd recommend against any cheap red dot and I'd bet that, if you buy one, you will soon replace it with a decent one. Save your money.
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