OneLeaf PM-3 45° Offset Mount
Offset accessory mount · $89
Mount
How the scope attaches to the rifle: standard rings or a rail clamp, fixed or quick-detach. A good mount does more to hold zero than anything else.
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Optics it fits
OneLeaf says: Mars mini Adapter & Mounts category: "engineered specifically for the Oneleaf Mars mini". The Mars mini page lists PM-1 through PM-5 and says it "integrates with rifle setups using optional mounts (Picatinny; 30mm ring, 45° offset, etc.)".
Maker says it fits
Specs
| Type | |
|---|---|
| Type Mount How the scope attaches to the rifle: standard rings or a rail clamp, fixed or quick-detach. A good mount does more to hold zero than anything else. | Offset accessory 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"45 Degree Offset Picatinny Rail Mount"; attaches to "either the right or left side of the weapon" |
| 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. | Not statedClamp type not described |
| Holds | |
| Holds | RMR footprint"with RMR interface"; holds the sight at 45 degrees beside the primary optic |
| 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. | Not published |
| 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. | Not stated |
| 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 published |
| 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. | Not published |
| Material | AL7075-T6 aluminum (Mars mini Adapter & Mounts category page: "Crafted from aerospace-grade AL7075-T6, each adapter") |
| 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 | PM-3 |
| 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. | $89OneLeaf store (oneleaf.ai) |
"Designed to mount an RMR at a 45 degree angle as a secondary sight next to your primary optic which makes it ideal for close range Shooting." Six screws and two Allen keys included. OneLeaf publishes no dimensions, height or weight.
Source: OneLeaf store, PM-3 page, OneLeaf Mars mini Adapter & Mounts category page.
Added October 12, 2026 · Specs last checked October 12, 2026