Magpul MBUS 3 Flip Up AR-15 Iron Sight - Rear - Olive Drab Green - Open Box

Magpul MBUS Pro LR Rear Sight - Black - Open Box

FAB Defense FXFRBS Front/Rear Folding Back-Up Sights AR-15/ M16/ M4 Low Profile Dual Aperture Rear Sight Black Polymer and Metal

Leapers UTG ACCU-SYNC Spring-loaded AR15 Flip-up Rear Sight - Black

FAB Defense FXRBS Rear Back-Up Sight for AR-15/ M16/ M4 Dual Aperture Low Folded Profile Spring-Locked Deployment Black Polymer & Metal

FAB Defense FXFBS Front Back-Up Sight for AR-15/ M16/ M4 Low Folded Profile Spring-Locked Deployment Black Polymer & Metal

UTG MNT755 UTG Accu-Sync Flip-Up Front Black AR-15 AR Platform Flip Up Back Up Front Sight

Griffin Armament M2 Rear Sight - Open Box