Sightmark Tactical 34mm Fixed Cantilever Mount
One-piece scope mount · 34 mm · 1.5 in height · 5.9 oz · $96
Cantilever mount
A one-piece mount whose rings sit forward of the rail clamp, usually about 2 in. It moves the scope forward so a thermal's short eye relief works on an AR-15's flat-top rail.
Check price
Affiliate links (Amazon, eBay): we may earn a commission. Prices change; the retailer's page is the current one.
Optics it fits
Sightmark says: Generic 34 mm scope mount; Sightmark names no specific optics.
No optic on this site is named by a maker for this mount, and none has a published interface that matches it yet. Optic pages show a mount only after the optic maker's own mounting figures have been checked.
Specs
| Type | |
|---|---|
| Type Cantilever mount A one-piece mount whose rings sit forward of the rail clamp, usually about 2 in. It moves the scope forward so a thermal's short eye relief works on an AR-15's flat-top rail. | One-piece scope mount |
| Mounts to | |
| Clamps onto Picatinny and Weaver rails The slotted rails most mounts clamp onto. Picatinny (MIL-STD-1913) has evenly spaced slots of one width; Weaver slots are narrower and spaced irregularly. Weaver mounts fit Picatinny; the reverse not always. | Picatinny"Fits Picatinny rails"; spec sheet mount type: "Picatinny" |
| Quick-detach QD mount A quick-detach mount: a lever or throw clamp takes the scope off the rail without tools. Worth it only if it goes back to the same zero, so mark the rail slot. | NoFixed mount: the manual has the mount clamp tightened with Allen screws (4 mm key, 40 to 50 in-lbs) |
| Holds | |
| Holds | 34 mm rings34 mm rings |
| Ring size Ring size The inside diameter of scope rings: 1 in (25.4 mm), 30, 34 or 35 mm. It must equal the scope's tube diameter. Many thermal scopes have a 30 mm tube; others take only their maker's mount. | 34 mm |
| Geometry | |
| Height, as published Scope height over bore How far the scope's center sits above the barrel's center. It decides your cheek weld and the bullet's path at close range. We calculate only the part above the rail, where makers publish it. | 1.5 in (38.1 mm)Centerline height (in/mm): 1.5” / 38.1 |
| Where the height is measured | Centerline height; the maker does not say where it is measured from |
| Cantilever Cantilever mount A one-piece mount whose rings sit forward of the rail clamp, usually about 2 in. It moves the scope forward so a thermal's short eye relief works on an AR-15's flat-top rail. | Yes |
| Forward offset Cantilever mount A one-piece mount whose rings sit forward of the rail clamp, usually about 2 in. It moves the scope forward so a thermal's short eye relief works on an AR-15's flat-top rail. | Not publishedOffset: the store page and spec sheet list "2” forward offset" for the family, but the user manual's feature list ties "2” forward offset" to SM34021 and SM34024 only, so offsetMm is null for this SKU. |
| Built-in cant | 0 MOA |
| Length | 6 in (152 mm) |
| Torque | Mount hex nut 40-50 in-lbs; torx scope ring screws 22-25 in-lbs (spec sheet and manual) |
| Weight and build | |
| Weight Weight How heavy the device is. Check whether the maker weighed it with or without the battery, because brands do it differently. | 0.4 lb (0.17 kg)5.9 oz (spec sheet; ounces only) |
| Material | Aluminum 6061-T6, matte black |
| Buying | |
| Made in | Not published |
| Warranty Warranty How long the maker promises to repair or replace a faulty unit. Check whether it needs registration and whether it passes to a second owner. | Not published |
| Maker part number | SM34022 |
| US price US price The price we found for the unit in the US, with where it came from and when. Prices change often, so treat it as a snapshot. | $96Sightmark store (sightmark.com) |
Values from the per-SKU spec sheet table, which the store page's combined "or" table leaves ambiguous. The manual's feature list ties the 20 MOA slope to SM34021 and SM34024 only, so SM34022 is stored as 0 MOA.
Source: Sightmark store, Tactical 34mm Cantilever Mount page (SM34022, SM34024), Sightmark spec sheet (PDF, SM34022, SM34023, SM34024), Sightmark cantilever mounts user manual (PDF, SM34019-SM34024).
Added October 12, 2026 · Specs last checked October 12, 2026
More from Sightmark
Sightmark · Device mount
Wraith HD Replacement Mount
Sightmark · Device mount
Wraith Mini Long Mount
Sightmark · Device mount
Wraith 4K Monocular Fixed Picatinny Mount