I've had really good luck with the GG&G M.A.D. BUIS. My agency has about 200 of these in service currently. The only problem we have had with them is when operators forget to depress the detent when folding it down. It doesn't affect the zero, but does break the locking assembly.
The other nice feature with the GG&G is it is very low profile so you do not have to worry about it fitting underneath whatever glass you mount.
I also have experience with the Troy folding sight and the Magpul. Have not had any problems with them so far.
Experience Teaches - Dito
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