Quick Detachable Front Sight with Adjustable A2 Square Post Assembly to Fit All 20mm Picatinny/Weaver Style Rails Equipped with Locking Retention Thumb Nut andClever and Robust Flip-up Posi-lock Design to Guarantee Zero in the Most Extreme Combat Condition Precision Elevation Adjustments to Enhance Shooting Accuracy Profile Designed for Installation on Gas Block
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