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![Best Backup Iron Sights (BUIS) [View-Throughs] - Pew Pew Tactical](https://www.pewpewtactical.com/wp-content/uploads/2017/08/Rear-sight-1-e1503684059322.jpg "Best Backup Iron Sights (BUIS) [View-Throughs] - Pew Pew Tactical")