Iron Sights & Backup Sights

Back up your optic with our range of iron sights and backup sights at Onyx Armaments. Shop flip-up front, rear and 45° offset sights in lightweight polymer and rugged all-steel, designed to co-witness under your optic and deploy in an instant.

About this range

Iron Sights & Backup Sights, explained.

From budget-friendly backups to precision sights tough enough to run as a primary, our AR-15 backup iron sights hold zero through hard use. Leading brands. £5 tracked UK delivery in 7–10 business days.

Straight-pull builds: these sights clamp to any MIL-STD-1913 Picatinny rail, so they fit UK straight-pull and rimfire AR rifles with a flat-top upper or railed gas block. Read our straight-pull AR-15 parts guide for what fits and what does not.

Polymer or steel? Read our comparison of the Magpul MBUS 3 vs MBUS Pro — weight, durability, co-witness and price.

Shooting CSR? Iron-sight classes are part of Civilian Service Rifle, so backup sights earn their place. Read our CSR kit guide for a straight-pull AR-15 — stock, sling and sights for service rifle practices.

Explore more: Magpul MBUS Sights, or all AR-15 Parts & Accessories.