---
product_id: 517372141
title: "11mm Dovetail to 21mm Upgraded Build-in Locking Screws Picatinny Rail Low Profile Scope Mount Converter Base 3/8\" to 7/8\" Converter"
brand: "bontok"
price: "€ 11.41"
currency: EUR
in_stock: true
reviews_count: 8
category: "Bontok"
url: https://www.desertcart.ie/products/517372141-11mm-dovetail-to-21mm-upgraded-build-in-locking-screws-picatinny
store_origin: IE
region: Ireland
---

# 3.94-inch length with 9-slot Picatinny rail for versatile mounting 3 built-in locking screws for rock-solid stability Recoil-resistant stop-pin prevents sliding under fire 11mm Dovetail to 21mm Upgraded Build-in Locking Screws Picatinny Rail Low Profile Scope Mount Converter Base 3/8" to 7/8" Converter

**Brand:** bontok
**Price:** € 11.41
**Availability:** ✅ In Stock

## Summary

> 🔧 Elevate your aim with precision and zero compromise!

## Quick Answers

- **What is this?** 11mm Dovetail to 21mm Upgraded Build-in Locking Screws Picatinny Rail Low Profile Scope Mount Converter Base 3/8" to 7/8" Converter by bontok
- **How much does it cost?** € 11.41 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/517372141-11mm-dovetail-to-21mm-upgraded-build-in-locking-screws-picatinny)

## Best For

- bontok enthusiasts

## Why This Product

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

## Key Features

- • **Zero Slide Guarantee:** Integrated recoil stop-pin locks the adapter in place, eliminating unwanted movement during rapid fire.
- • **Lock & Load with Confidence:** Triple locking screws ensure your scope stays perfectly zeroed, no matter the recoil.
- • **Expanded Mounting Real Estate:** 9-slot Picatinny rail offers ample space for multiple optics or accessories without snagging.
- • **Seamless 11mm to 21mm Conversion:** Effortlessly upgrade your firearm’s optics compatibility with a sleek low-profile adapter.
- • **Precision Aircraft Aluminum Alloy:** Durable, lightweight, and corrosion-resistant matte black finish for professional-grade reliability.

## Overview

The Bontok 11mm to 21mm Picatinny Rail Adapter is a precision-machined aircraft aluminum alloy converter designed to upgrade 11mm dovetail mounts to a versatile 21mm Picatinny rail. Featuring a 3.94-inch length with 9 slots, built-in triple locking screws, and a recoil-resistant stop-pin, it ensures a secure, zero-retentive, and snag-free optics mounting solution favored by serious shooters and tactical pros alike.

## Description

desertcart.com: Bontok Dovetail to Picatinny Rail Adapter, 11mm Dovetail to 21mm Upgraded Build-in Locking Screws Picatinny Rail Low Profile Scope Mount Converter Base 3/8" to 7/8" Converter-9 Slots-Black-(1 Pack) : Sports & Outdoors

Review: Fits well to 11mm dovetail mount on Gamo Wildcat Whisper - Very good product. Fits very well on Gamo Wildcat Whisper. The edge is pretty sharp, that’s why it fits well in that 11mm dovetail mount. The only recommendation - buy longer than 9 slots. Next time I would buy 11 at least. For the money it’s great.
Review: Great quality product - Works great, very sturdy and seems tough, definitely buying again if needed in the future.

## Features

- Convert 11 mm Dovetail to 21 mm Picatinny Rail: Dovetail to Picatinny rail adaptor for firearms equipped with 11mm or 3/8 inch dovetail standard and extends 3.94 inches allowing for more flexible optics placement..
- Precision Material: Precision machined out of solid structure aircraft aluminum alloy in black matte coating anodizing finish.
- Upgraded Build-in Locking Screws: Three high strength build-in locking screws of side ensure a solid mount to lock up on rail.
- No Sliding: Recoil resistant stop-pin on the top provides in additional zero retention against recoil force to prevent the adapter from sliding.
- 9 Slots Style Rail: 3.94" picatinny rail with 9 slots with a 0.59" saddle height provides ample space for snag free mounting of different sized picatinny standard scopes.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BPPRB28H |
| Best Sellers Rank | #5,557 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #8 in Sporting Optics Mounts |
| Brand Name | Bontok |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,279) |
| Date First Available | December 10, 2022 |
| Included Components | Convert 11mm Dovetail to 21mm Picatinny Rail |
| Item Package Dimensions L x W x H | 6.02 x 1.85 x 0.71 inches |
| Package Weight | 0.07 Kilograms |
| Style | 1 PACK - 9 Slots |
| Warranty Description | 180 |

## Images

![11mm Dovetail to 21mm Upgraded Build-in Locking Screws Picatinny Rail Low Profile Scope Mount Converter Base 3/8" to 7/8" Converter - Image 1](https://m.media-amazon.com/images/I/61ojBXTugSL.jpg)

## Available Options

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

## Questions & Answers

**Q: Does this fit Cricket chipmunk ?**
A: If you are using the Crickett® or Chipmunk® Rifle Scope Mount Kit it which has a 3/8 dovetail this adapter may be 1/16 of an inch too wide to securely clamp to the rail.

Manufacturers tend to round rail widths, I this this will work. Worst case a small shim could be used to bridge the gap.

**Q: Will this fit on a crosman 357 snr?**
A: I do not believe that the crossman 357 snub nose pistol has a dove tail rail. The owner's manual does not make mention of this and the rail is not called out on the photo graph of the pistol.

**Q: Day 2 on a next day delivery for prime. still hadn't shipped. bait and switch game with smazon.**
A: Shipping delays can occur - with the current shipping company labor action on the horizon 2 of my orders in the  past two weeks (12 items total) were delayed. Annoying but Prime is still far better than other vendors for next day deliveries.

**Q: Will this fit a Molson nagant**
A: My gut is telling me no, however while I don't own a Molson I know someone who does, and he has an adapter on it, which is also a universal Picatinny Rail(also no). If you have a Archangel M-1891, I would also say no it won't fit. This is probably meant for small rail set-up like BB gun or Sidearms.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fits well to 11mm dovetail mount on Gamo Wildcat Whisper
*by J***Y on December 3, 2025*

Very good product. Fits very well on Gamo Wildcat Whisper. The edge is pretty sharp, that’s why it fits well in that 11mm dovetail mount. The only recommendation - buy longer than 9 slots. Next time I would buy 11 at least. For the money it’s great.

### ⭐⭐⭐⭐⭐ Great quality product
*by W***L on February 12, 2026*

Works great, very sturdy and seems tough, definitely buying again if needed in the future.

### ⭐⭐⭐⭐⭐ Works as advertised, thanks.
*by Q***O on May 9, 2025*

This is a quality item that grips my Hatsan Mod 25 pistol's 11mm dovetail rails firmly, and I had no trouble mounting Picatinny optics on the top of it. It has three holding screws which is very appropriate for the air guns it will mostly be mounted on (they have intense recoil shocks). The screws are small Torx head for which the vendor supplies the proper "hex" key. My only recommendation would be to make the screws larger in diameter or of high-grade steel. That's because you may want to use loc-tite / threadlocker on them, and even the blue version of that stuff can hold so tight that you won't be able to get these screws out without snapping them off. Don't ask me how I know this.

## Frequently Bought Together

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-28*