Scope Mounts & Optic Risers

Get your optic to the right height with our range of optic mounts and risers at Onyx Armaments. Shop Picatinny red dot mounts, 30mm, 34mm and 35mm scope mounts, offset mounts, optic risers and shotgun receiver saddles from Reptilia, Daniel Defense, BCM and Magpul.

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About this range

Scope Mounts & Optic Risers, explained.

Bore height sets your head position behind the rifle, and the mount is what holds your zero. Choose 1.54" for lower 1/3 co-witness with standard AR-15 irons, or 1.93" for a head-up position where the irons sit below the window, a matched ring mount for your scope tube, or a 45-degree offset so a dot sits alongside magnification. £5 tracked UK delivery in 7–10 business days.

Which mount do you need? Read our optic mount height guide — 1.54in vs 1.93in, co-witness and risers explained — and the M-LOK vs Picatinny mounting guide for how each interface works.

Explore more: Reptilia, Iron Sights & Backup Sights, or all Precision Rifle Scope Mounts, Offset Optic Mounts & Sights, or all AR-15 Parts & Accessories.