2PCS 100mm Rail Mount 11mm to 20mm Dovetail Rail Extension Adapter High Profile Low Profile 9 Slots Scope Mount Base Medium Profile Base Riser Mounting

£18.99 (as of 10/20/2026 07:58 PST - DetailsProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

This 2PCS 100mm rail mount is an 11mm dovetail to 21mm rail extension adapter with a 9 slot top rail. It is a practical choice for buyers who want more flexible scope or accessory placement, with low profile and high profile base options listed. Check your dovetail size and chosen profile before ordering.

SKU: B0C3GGN9TL Category:

Quick Summary

This 2PCS 100mm Rail Mount is a dovetail rail extension adapter with a 9 slot top rail and both high profile and low profile base options. It is designed to convert an 11mm dovetail to a 21mm rail, giving a longer mounting area for scopes, red dots, or other accessories.

Who It Is Best For

This suits buyers who need a rail adapter for 11mm dovetail mounts and want a more flexible mounting position for optics. It is also useful if you want a base with both low profile and high profile options and prefer a simple setup with a stop pin and included Allen wrench.

What To Know Before You Buy

The adapter is described as being made from aircraft grade aluminium alloy with a black hard coat anodise finish. It is listed as 100mm, with a base length of 2.94 inches and a rail length of 3.94 inches. The top rail has 9 slots and is described as a 21mm Picatinny rail.

Pros: It combines 11mm dovetail conversion with a 9 slot top rail and includes both low profile and high profile base options.

Cons: Check your exact dovetail size and selected setup before ordering, as rail fit and profile choice need to suit your mount.

Common Buyer Questions

What does this rail adapter do?
It converts an 11mm dovetail setup to a 21mm rail for mounting compatible optics or accessories.

Does it have a Picatinny style top rail?
Yes, the top rail is described as a 21mm Picatinny rail with 9 slots.

Can I use it for a scope or red dot?
It is described as suitable for standard scopes, red dots, or other accessories that fit the rail.

Is installation meant to be simple?
It is described as easy to install using the dovetail mount, a vertical stop pin, and the included Allen wrench.

Should I check the fit before ordering?
Yes, it is sensible to check your dovetail size and chosen profile so the adapter suits your setup.

Key Details

DetailWhat it means in use
Quantity2 pieces
Rail size11mm dovetail to 21mm rail conversion
Top rail slots9 slots for accessory placement
Profile optionsLow profile and high profile base options are listed
MaterialAircraft grade aluminium alloy
FinishBlack hard coat anodise finish
Included fitting aidAllen wrench is mentioned for installation

Final Buying View

If you need an 11mm dovetail to 21mm rail adapter with a 9 slot top rail, this 2 piece mount gives you a practical way to add more mounting options. The included low profile and high profile choices make it easier to match different setups, while the stop pin and Allen wrench add convenience. Check your rail size and preferred profile before ordering, then choose the version that suits your mount.

Brand

BILLION DUO

Manufacturer

BILLION DUO

Product Group

Sports

EAN

6933554996663

Warranty

360

Color

Black

Size

100mmx20.9mm

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