Daniel Defense A1.5 Fixed Rear Sight for AR-15

The Daniel Defense A1.5 is a fixed rear iron sight for AR-15 and M4 rifles, mounting to any Military Specification flat-top upper receiver.

A backup sight that stays out of the way of a reflex optic — and out of the way of the charging handle, which is the part most rear sights get wrong.

Daniel Defense describes the A1.5 as the optimum backup iron sight for shooters using today's most popular reflex optics, and the reason is its profile: it is lightweight and streamlined enough to sit under a red dot without cluttering the sight picture. It also accommodates M4-type rifles without interfering with charging handle operation, which is the practical failure of a tall rear sight and the thing you only discover after fitting one.

Construction is one piece, machined from 6061 aircraft-grade aluminium with a Military Specification Hard Coat Anodized finish. It installs on a flat-top upper with a slotted fastener threaded into a self-locking steel insert, so there is no separate nut to lose and nothing to work loose in use. It weighs 1.7 oz (48 g).

Being fixed rather than folding means there is nothing to deploy and nothing to fail, which is why fixed sights persist on rifles that are shot deliberately — including a UK straight-pull AR-15 set up for irons or for irons behind a dot.

Why shooters choose the A1.5 Rear Sight

• Streamlined for reflex optics — sits under a red dot without dominating the window
• Clears the charging handle — designed to work on M4-type rifles without fouling it
• One-piece construction — nothing hinged, nothing sprung, nothing to deploy
• 6061 aircraft-grade aluminium — Military Specification Hard Coat Anodized
• Self-locking steel thread insert — a slotted fastener into a secured insert, not a bare tapped hole
• 1.7 oz (48 g) — the weight of a backup sight should be forgettable

What the A1.5 Rear Sight fits

Fits any Military Specification flat-top upper receiver on AR-15/M4 rifles, including UK straight-pull AR-15 builds, and secures with a slotted fastener threaded into a self-locking steel insert. It is a fixed, non-folding sight, so it stands proud at all times — suited to a dedicated iron-sight rifle or a permanently deployed backup behind a red dot, rather than to a rifle wearing a large magnified scope. Its matching front is the Daniel Defense Rail Mounted Fixed Front Sight at £99.99. If you need both, buy the pair as a set: the Daniel Defense Rock & Lock AR-15 Iron Sight Set contains this rear sight and that front sight for £189.99, against £249.99 for the two singles — a £60.00 saving. Buy this sight on its own only if you need the rear alone.

Specifications

Fixed, low and out of the way. Order the Daniel Defense A1.5 Rear Sight today — in stock at Xtreme Tactical Gun Parts with free tracked UK delivery in 7–10 days.

Explore more: Iron Sights & Backup Sights, AR-15 Parts & Accessories or browse all Daniel Defense.