GDT AR15 AR 15 Front and Rear 45 Degree Rapid Transition BUIS Backup Iron Sight

For AR-15 / M16 type rifles, optical sights provide superior performance at longer ranges, but iron sights can be more effective for close-range engagements. However, attaching an optical sight either prevents the use of iron sights or results in a setup that produces a front sight "shadow" on the optical image, and/or results in problematic transitions from optical to backup iron sig More »