The Primary Arms SLx 30mm Cantilever Scope Mount, 1.5 in height, black (part number 910105, SKU PA-SLX-CM-30-1.5) is a one-piece aluminium cantilever mount that fixes a 30 mm tube rifle scope to an M1913 Picatinny rail at a 1.5 in (38 mm) optical centreline, using secure multi-bolt clamping and a black anodised finish.
The SLx line exists to give the mounting function of the premium PLx mounts at a price that suits the scope most people are actually fitting. You get the same essentials — a rigid one-piece body, a forward cantilever that sets correct eye relief on an AR-pattern rifle, and multi-bolt clamping onto Picatinny — without the 7075 alloy and steel hardware specification of the PLx range.
How It Compares
This is the value 30 mm mount at standard height. For 34 mm tube scopes such as the SLx 1-10x28, use the Primary Arms SLx 34 mm cantilever mount. For a stronger specification in 7075 aluminium with grade 12.9 steel hardware and over 6,500 lb of clamping force, step up to the Primary Arms PLx 30 mm cantilever mount at 1.5 in height, or the PLx 30 mm cantilever mount at 2.04 in height for a heads-up position. This mount fits the 30 mm tube of the SLx 1-6x24 Gen IV with the ACSS Nova reticle and the PLxC 1-8x24 SFP with the ACSS Nova reticle. Browse all rifle scope mounts and the wider Primary Arms range.
Ideal For
- Straight-pull AR-platform rifles in Great Britain needing forward eye relief from a receiver rail
- Civilian Service Rifle and practical rifle builds on a sensible budget
- First-time LPVO fitting, where the mount should not cost as much as the scope
- Any 30 mm tube rifle scope on an M1913 Picatinny rail
Key Features
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Ring size: 30 mm, for scopes with a 30 mm main tube
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Height: 1.5 in (38 mm) optical centreline, the conventional height for a normal cheek weld
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Construction: One-piece aluminium body
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Retention: Secure multi-bolt clamping onto the rail
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Cantilever: Sets correct eye relief on AR-pattern rifles where the receiver rail ends too far back
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Rail: M1913 Picatinny
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Finish: Black anodised
Technical Specifications
| Product Type |
One-piece cantilever rifle scope mount |
| Ring Diameter |
30 mm |
| Height |
1.5 in (38 mm) optical centreline |
| Rail |
M1913 Picatinny |
| Material |
Aluminium |
| Retention |
Secure multi-bolt clamping |
| Finish |
Black anodised |
| Series |
Primary Arms SLx |
| SKU / MPN / UPC |
PA-SLX-CM-30-1.5 / 910105 / 818500019527 |
What's Included
- Primary Arms SLx 30 mm cantilever scope mount, 1.5 in height
UK Delivery & Support
This mount is UK-stocked and dispatched tracked from our UK warehouse — no import duties and no customs delays — backed by UK-based aftersales support.
Frequently Asked Questions
What size scope tube does the Primary Arms SLx 30mm cantilever mount fit?
This mount has 30 mm rings, so it fits rifle scopes with a 30 mm main tube. A scope with a 34 mm tube needs the Primary Arms SLx 34 mm cantilever mount instead.
What rail does this mount attach to?
The Primary Arms SLx 30 mm cantilever mount attaches to an M1913 Picatinny rail using secure multi-bolt clamping.
What does 1.5 in height mean on a scope mount?
The 1.5 in figure is the optical centreline height, measured from the top of the Picatinny rail to the centre of the scope tube, which is the conventional height and gives a normal cheek weld on most AR-pattern rifles.
Why choose a cantilever mount rather than separate rings?
A cantilever mount extends the rings forward of the rail section it clamps to, which is necessary on AR-pattern rifles to set correct eye relief, and its one-piece body keeps the two rings in alignment so the scope tube is not stressed.
How does the SLx mount differ from the PLx mount?
The SLx mount provides the same one-piece cantilever function at a lower price, while the PLx mount is built from 7075 aluminium with grade 12.9 steel hardware, three-bolt rings, dual recoil lugs and over 6,500 pounds of clamping force.
