Vortex Cantilever Ring Mount 1 Inch (3 Inch Offset)

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Vortex · Cantilever · 1 Inch
3 Inch Offset for 1-Inch Scopes The Vortex Cantilever Ring Mount CM-103 is a one-piece mount for scopes with a 1 inch / 25.4 mm main tube. The 3 inch / 7.62 cm offset moves the optic forward, creating space for the desired eye position on a Picatinny platform.
The key buying point is the combination of tube diameter, existing rail, and required offset.

Our honest assessment
A cantilever mount is especially useful when the optic needs to sit further forward without moving the clamping surface forward as well. For 1-inch optics, the CM-103 is a clear, specialised solution. For 30 mm or 34 mm tubes, it is simply the wrong size.


Fits well if … … your scope has a 1 inch / 25.4 mm main tube and you need additional forward offset on Picatinny.
… eye relief and optic position don’t align well with normal single rings.


Probably doesn’t fit if … … your scope has a 30 or 34 mm main tube.
… your platform doesn’t offer a suitable Picatinny mounting area or you don’t need any forward offset at all.


Features with practical impact


3 inch offset 7.62 cm forward offset gives more freedom in positioning the scope and thus the eye relief.
1-inch rings 25.4 mm must fit the main tube exactly. Barrel diameters are not interchangeable.


One-piece design Ring position and base form a fixed unit. This simplifies the setup but reduces flexibility compared to two individually positionable rings.


Picatinny-oriented The mount is designed for corresponding rail systems. Check available slots and position on the system beforehand.


Limits & avoid bad purchases
1 inch is not 30 mm. This size difference alone makes the mount incompatible. Also check before purchase if 3 inch offset actually fits your eye relief, rail length, and the design of your scope.
Technical data with practical interpretation


Barrel diameter 1 inch / 25.4 mm – decisive measurement for ring fit.


Offset 3 inch / 7.62 cm – shifts the optic significantly forward.


Design One-piece cantilever scope mount for Picatinny applications.


Identification Vortex CM-103 – model code discreetly for clear identification.


Scope of delivery
1 × Vortex Cantilever Ring Mount CM-103 for 1-inch main tube with 3-inch offset. Scope and other attachments are not included.
Safe mounting
Only mount on unloaded, secured equipment. Check barrel diameter and rail beforehand, apply rings evenly and without tension, and use only the specified screws and manufacturer torque settings. After mounting, check eye relief, clearance, and secure fit.
FAQ
Does the mount fit a 30 mm scope tube? No. This version is designed for 1 inch or 25.4 mm main tube. What does 3 inch offset mean? The ring position is shifted about 7.62 cm forward relative to the base. This helps with scope positioning and eye relief. Is the scope included? No. The mount is offered only.
Black Raptor · Purchase decision
The right solution if 1 inch and 3 inch offset fit your setup exactly. Check barrel size and required offset first – then the choice is clear.