Samson 020005901 True Backup Sight Aluminum Picatinny Rail, Rifle Sights

Since these backup sights were never meant to be the primary aiming system, we did away with the dual apertures and went with a single .160 aperture which is small enough for accurate shooting yet large enough to still be of use in low-light. Accepts all aftermarket front sight post replacements with MIL-SPEC dimensions. Both front and rear backup sights lock in the folded and deployed position. The durable construction and solid mounting system guarantees you'll stay on-zero. Perfect (M4) co-witness height, Stainless steel clamp