The Primary Arms SLx 34mm Cantilever Scope Mount, 1.5 in height, black (part number 910107, SKU PA-SLX-CM-34-1.5) is a one-piece aluminium cantilever mount that fixes a 34 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.
Thirty-four millimetre tubes are less common than 30 mm and the mount is easy to get wrong — a 30 mm mount will not close around a 34 mm tube, and shimming one is not a fix. This is the correct partner for the Primary Arms SLx 1-10x28, which uses a 34 mm one-piece tube, and for any other 34 mm scope going onto an AR-pattern rifle where the rings need to reach forward for eye relief.
How It Compares
This is the 34 mm version of the value SLx mount. For scopes with a 30 mm tube — which is most of the Primary Arms range — use the Primary Arms SLx 30 mm cantilever mount instead. For a premium 30 mm mount in 7075 aluminium, see the Primary Arms PLx 30 mm cantilever mount at 1.5 in height or the taller PLx 30 mm cantilever mount at 2.04 in height. This mount is the matching part for the 34 mm tube of the Primary Arms SLx 1-10x28 rifle scope with the ACSS Griffin M10S reticle. Browse all rifle scope mounts and read our scope mounts and rings buyer's guide.
Ideal For
- Fitting the Primary Arms SLx 1-10x28, which has a 34 mm tube
- Straight-pull AR-platform rifles in Great Britain running a 34 mm tube scope
- Civilian Service Rifle and practical rifle builds needing forward eye relief
- Any 34 mm tube rifle scope on an M1913 Picatinny rail
Key Features
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Ring size: 34 mm, for scopes with a 34 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 |
34 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-34-1.5 / 910107 / 818500019541 |
What's Included
- Primary Arms SLx 34 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 34mm cantilever mount fit?
This mount has 34 mm rings, so it fits only rifle scopes with a 34 mm main tube. A 30 mm scope requires the Primary Arms SLx 30 mm cantilever mount instead.
Which Primary Arms scope uses a 34 mm tube?
The Primary Arms SLx 1-10x28 rifle scope is built on a 34 mm one-piece 6061-T6 aluminium tube, so this is the mount it needs.
What rail does this mount attach to?
The Primary Arms SLx 34 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.
Can I fit a 34 mm scope in a 30 mm mount?
No. Ring diameter must match the scope's main tube exactly, so a 34 mm scope will not fit 30 mm rings and must not be forced or shimmed.
