---
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: "€ 18.26"
currency: EUR
in_stock: true
reviews_count: 8
category: "Bontok"
url: https://www.desertcart.fi/products/517372141-11mm-dovetail-to-21mm-upgraded-build-in-locking-screws-picatinny
store_origin: FI
region: Finland
---

# 3.94-inch length with 9 versatile Picatinny slots 3 built-in locking screws for rock-solid stability Aircraft-grade aluminum alloy with matte anodized finish 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:** € 18.26
**Availability:** ✅ In Stock

## Summary

> 🔧 Elevate your aim with precision and style — never miss the shot that counts!

## 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?** € 18.26 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/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

- • **Effortless Upgrade:** Quick and secure installation transforms your firearm’s mounting system for next-level optics compatibility.
- • **Built to Lock & Last:** Three high-strength locking screws ensure your optics stay firmly mounted, no sliding under recoil.
- • **Sleek Low Profile Design:** Matte black anodized aircraft aluminum offers durability and stealthy aesthetics for the modern marksman.
- • **Versatile Mounting Space:** 9-slot, 3.94-inch rail provides ample room for a variety of scopes and accessories without snagging.
- • **Precision Fit, Zero Drift:** Engineered to convert 11mm dovetail to 21mm Picatinny rail with recoil-resistant stop-pin for unmatched zero retention.

## Overview

The Bontok 11mm to 21mm Picatinny Rail Adapter is a precision-machined aircraft aluminum mount converter featuring 3 built-in locking screws and a recoil-resistant stop-pin. Its 3.94-inch length with 9 slots offers versatile optics placement, ensuring a secure, low-profile upgrade from dovetail to Picatinny rails for enhanced firearm customization.

## 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 fit and build quality - Great fit and build quality. The installation was easy and worked well to install my red dot.

## 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 | #6,408 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #10 in Sporting Optics Mounts |
| Brand Name | Bontok |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,266) |
| 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 fit and build quality
*by J***N on September 27, 2025*

Great fit and build quality. The installation was easy and worked well to install my red dot.

### ⭐⭐⭐⭐⭐ Very secure
*by A***R on December 30, 2025*

Great product blocks securely to my dovetail. This seems very sturdy. Mounted my thermal scope perfectly.

## Frequently Bought Together

- 11mm Dovetail to 21mm Upgraded Build-in Locking Screws Picatinny Rail Low Profile Scope Mount Converter Base 3/8" to 7/8" Converter
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**Shop now:** [https://www.desertcart.fi/products/517372141-11mm-dovetail-to-21mm-upgraded-build-in-locking-screws-picatinny](https://www.desertcart.fi/products/517372141-11mm-dovetail-to-21mm-upgraded-build-in-locking-screws-picatinny)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-22*