---
product_id: 339120945
title: "LONSEL Dovetail to Picatinny Rail Adapter 11mm Dovetail to 21mm Picatinny Rail Convert Mount - Low Profile Scope Riser Rail Adaptor - Base Mount 3/8\" to 7/8\" Converter"
brand: "lonsel"
price: "¥2304"
currency: JPY
in_stock: true
reviews_count: 8
category: "Lonsel"
url: https://www.desertcart.jp/products/339120945-lonsel-dovetail-to-picatinny-rail-adapter-11mm-dovetail-to-21mm
store_origin: JP
region: Japan
---

# Converts 11mm dovetail to 21mm Picatinny rail Low profile 0.59" riser with 9-slot rail Aircraft-grade aluminum alloy LONSEL Dovetail to Picatinny Rail Adapter 11mm Dovetail to 21mm Picatinny Rail Convert Mount - Low Profile Scope Riser Rail Adaptor - Base Mount 3/8" to 7/8" Converter

**Brand:** lonsel
**Price:** ¥2304
**Availability:** ✅ In Stock

## Summary

> 🔧 Elevate your gear game — convert, mount, and dominate with precision!

## Quick Answers

- **What is this?** LONSEL Dovetail to Picatinny Rail Adapter 11mm Dovetail to 21mm Picatinny Rail Convert Mount - Low Profile Scope Riser Rail Adaptor - Base Mount 3/8" to 7/8" Converter by lonsel
- **How much does it cost?** ¥2304 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/339120945-lonsel-dovetail-to-picatinny-rail-adapter-11mm-dovetail-to-21mm)

## Best For

- lonsel enthusiasts

## Why This Product

- Trusted lonsel brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Seamless Rail Conversion:** Effortlessly transform your 11mm dovetail mount into a versatile 21mm Picatinny rail, expanding your optics and accessory options.
- • **Versatile Mounting Platform:** Features 9 Picatinny slots to accommodate scopes, red dots, and other tactical accessories with precision.
- • **Optimized Low-Profile Design:** Maintain a sleek, tactical look with a 0.59" riser height that balances elevation without bulk.
- • **Precision Engineered Durability:** Crafted from premium aircraft-grade aluminum with a sleek black hard coat anodize finish for unmatched strength and longevity.
- • **Tool-Assisted Secure Installation:** Includes an Allen wrench and locking screws for a rock-solid, shake-free mount that stays put under pressure.

## Overview

The LONSEL Dovetail to Picatinny Rail Adapter is a precision-machined, aircraft-grade aluminum mount that converts 11mm dovetail rails to 21mm Picatinny rails. Featuring a low-profile 0.59" riser and 9-slot rail, it offers versatile mounting options for scopes and accessories. Easy to install with included tools, it ensures a secure, shake-free fit for professional-grade tactical setups.

## Description

LONSEL Dovetail to Picatinny Rail Adapter 11mm to 21mm Rail Low Profile Converter Adapters - Provide 1 Pack & 2 Pack to Meet Your Different Needs! Lightweight & Durable ｡◕‿◕｡Precision Machined from aircraft grade aluminum and finished in a matte black hard coat anodize, durable solid structure. 11mm To 21mm Rail Convert Adapter ｡◕‿◕｡ Compatible with 11mm or 3/8" dovetail mounts, can be used to convert to 21mm picatinny rail mount, allowing for more flexible optics. Low Profile Riser Rail Design ｡◕‿◕｡3.94" picatinny rail with 9 Slots with a 0.59" saddle height riser rail, provides more flexible optics placement and eye relief. Flexible Application ｡◕‿◕｡The adaptor's picatinny rail allows for the mounting of standard picatinny scopes, red dots, or other optics. Easy to Install ｡◕‿◕｡Three high strength locking screws ensure a solid mount-to-receiver lock up, attached allen wrench can help you to ensure tight enough, keep stable and no shaking. Package List ♣ [2 PACK]: 2 x 11mm Dovetail to Picatinny Rail Adapter + 2 x Allen Wrench (Optional) ♣ [1 PACK]: 1 x 11mm Dovetail to Picatinny Rail Adapter + 1 x Allen Wrench (Optional)

Review: Excellent Little Adapter That Solved My Mounting Problem - I bought this adapter so I could mount a Picatinny red dot sight on my pellet pistol, which only came with an 11mm dovetail rail. I wasn't sure what to expect at this price point, but this little adapter exceeded my expectations. Installation was quick and straightforward. It fit the dovetail rail perfectly, tightened down securely, and provided a solid Picatinny platform for my optic. Once everything was mounted, there was no noticeable movement or wobble, and my red dot held zero without any issues. The machining is surprisingly nice for such an inexpensive part. It feels sturdy, the finish looks great, and it doesn't look or feel like a bargain-bin accessory. What impressed me most was the value. For just a few dollars, it completely expanded my mounting options and allowed me to use the optic I already owned instead of buying a different sight. That's a huge upgrade for very little money. If you have a pellet gun, air rifle, or firearm with an 11mm dovetail rail and want to mount Picatinny accessories, this adapter is an easy recommendation. It fit perfectly, worked exactly as advertised, and turned out to be one of the best values I've purchased. Highly recommended!
Review: Nice conversion for Weaver to Picatinny. Easy to install. - Works well on a Winchester 190 to put a small red dot on it. Seems well made and had no problems holding zero.

## Features

- Precision Material: Premium out of aircraft grade aluminum alloy and black hard coat anodize finish, sturdy & durable.
- Convert 11 mm Dovetail to 21 mm Picatinny Rail: 2.94 inches length at the base, the picatinny rail extends 3.94 inches allowing for more flexible optics placement.
- Mount Base: Fit 11 mm dovetail mounts, Base mount 3/8" to 7/8" converter adapter. Low profile 0.59" riser rail for scope.
- Top With 9 Slots Style Rail: Top 21mm picatinny rail allows for the mounting of picatinny standard scopes, red dots or other accessories.
- Easy To Install: Rail adaptor installs easily via dovetail mount and one vertical stop pin, attached allen wrench can help you to tight stable and no shaking.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0982V87YJ |
| Best Sellers Rank | #5,518 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #3 in Sporting Optics Mounts |
| Brand Name | LONSEL |
| Color | Black |
| Customer Reviews | 4.5 4.5 out of 5 stars (3,418) |
| Date First Available | June 28, 2021 |
| Item Package Dimensions L x W x H | 5.83 x 3.15 x 0.75 inches |
| Manufacturer | LONSEL |
| Material | Aluminum |
| Package Weight | 0.06 kg |
| Style | 1 PACK - 9 Slots |

## Images

![LONSEL Dovetail to Picatinny Rail Adapter 11mm Dovetail to 21mm Picatinny Rail Convert Mount - Low Profile Scope Riser Rail Adaptor - Base Mount 3/8" to 7/8" Converter - Image 1](https://m.media-amazon.com/images/I/61SoFhfp4iS.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Will this fit a CZ 457?**
A: If the seller/manufacturer has stated the specifications correctly, it should "fit". AFAIK, 11mm on a CZ 457 is still 11mm on an air rifle. A few IMPORTANT caveats to keep in mind: (1:) I've not tried this product & do not "vouch" for it. (2.) When a mfr refuses to provide dimensional drawings, you SHOULD question their claims! (3.) Wrt the CZ 457, you really should COMPARE THIS to other products offered - note the diffs.

**Q: Will this work for gamo magnum g2 or maxxus g2?**
A: Don’t know but it is 15mm bottom and 20mm top I use it on a crossbow

**Q: Has anyone got this to fit on a Ruger break barrel air rifle?  The top of the dovetail is curved, not flat.**
A: that should not matter as all of my guns with a 11mm rail are curved as in cut into the side of a round tube

**Q: Will it mount a 20mm red dot ?**
A: Yes, it will mount a red dot scope with a picatinny base.  In fact, I have a red dot scope on a Lonsel adapter on my Weihrauch HW97K air rifle.   It puts 22 cal. pellets in the "X" Ring of the target, one after another in the same hole:  very accurate..... This is a sturdy, well constructed product.    D.W.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent Little Adapter That Solved My Mounting Problem
*by R***W on August 3, 2026*

I bought this adapter so I could mount a Picatinny red dot sight on my pellet pistol, which only came with an 11mm dovetail rail. I wasn't sure what to expect at this price point, but this little adapter exceeded my expectations. Installation was quick and straightforward. It fit the dovetail rail perfectly, tightened down securely, and provided a solid Picatinny platform for my optic. Once everything was mounted, there was no noticeable movement or wobble, and my red dot held zero without any issues. The machining is surprisingly nice for such an inexpensive part. It feels sturdy, the finish looks great, and it doesn't look or feel like a bargain-bin accessory. What impressed me most was the value. For just a few dollars, it completely expanded my mounting options and allowed me to use the optic I already owned instead of buying a different sight. That's a huge upgrade for very little money. If you have a pellet gun, air rifle, or firearm with an 11mm dovetail rail and want to mount Picatinny accessories, this adapter is an easy recommendation. It fit perfectly, worked exactly as advertised, and turned out to be one of the best values I've purchased. Highly recommended!

### ⭐⭐⭐⭐⭐ Nice conversion for Weaver to Picatinny. Easy to install.
*by H***W on August 1, 2026*

Works well on a Winchester 190 to put a small red dot on it. Seems well made and had no problems holding zero.

### ⭐⭐⭐⭐⭐ Works perfectly with Citadel 12 Gauge Warthog
*by D***K on May 6, 2026*

I have a Citadel 12 Gauge Turkish Warthog Semi-Auto Shotgun with dovetail rails on the top of the receiver. This fit it perfectly. Once tightened, the tap doesn’t move and looks it was made to fit. It is well made, has a great anodized finish without any blemishes. I highly recommend this if you the same shotgun as I do. I am sure it will serve me very well. I plan to mount a red dot on this rail very soon.

## Frequently Bought Together

- LONSEL Dovetail to Picatinny Rail Adapter 11mm Dovetail to 21mm Picatinny Rail Convert Mount - Low Profile Scope Riser Rail Adaptor - Base Mount 3/8" to 7/8" Converter
- LONSEL 1'' Scope Rings, 2Pcs High Profile or 2Pcs Medium Profile 1 Inch Scope Mount Rings for Picatinny Rail
- LONSEL 1'' Dovetail Scope Rings, 2 Pack High Profile or Medium Profile 1 Inch Scope Mount Rings for 11mm Dovetail Rails

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-10-12*