For those of us who plink or do this as hobby we just pack up our bags and go home or switch a rifle when the RDS fails. The way I see it BUIS are really just another piece of accessory to make the rifle look cool.
I've never been in combat so I can't say for combat situations
w210838 is the barrel guy don't forget.
Utimak AK ventilated handguard with Bushnell TRS25: $120 Shipped
Vltor AK - AR stock adapter with Magpul CRT: $120: shipped
Leupold Mark AR 1.5-4x SPR Firedot plus Aero Ultralight Extended Mount: $350 shipped
Buy 2 more more items for more discounts