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Tactical HK C4 Diopter Sight 416 417 Picatinny Sight Set Front & Back Iron Sight BUIS
Tactical Micro HK Style Sight Set Front and Rear Folding Low-Profile Sight Iron
45 Degree Offset Rapid Transition BUIS Backup Front & Rear Picatinny Sight Set
Tactical 300M MK18 Flip Up Iron Sight Set Folding BUIS Picatinny Rail Sight
Tactical Flip Up Rear Front Iron Backup Battle Sight HK Folding Sight Set