--- product_id: 517372141 title: "Bontok 11mm Dovetail to 21mm Upgraded Build-in Locking Screws Picatinny Rail Low Profile Scope Mount Converter Base 3/8\" to 7/8\" Converter" price: "418350₫" currency: VND in_stock: true reviews_count: 8 url: https://www.desertcart.vn/products/517372141-bontok-11mm-dovetail-to-21mm-upgraded-build-in-locking-screws store_origin: VN region: Vietnam --- # 3.94-inch rail length 3 built-in locking screws Recoil-resistant stop-pin Bontok 11mm Dovetail to 21mm Upgraded Build-in Locking Screws Picatinny Rail Low Profile Scope Mount Converter Base 3/8" to 7/8" Converter **Price:** 418350₫ **Availability:** ✅ In Stock ## Summary > 🔧 Upgrade your aim, lock your legacy. ## Quick Answers - **What is this?** Bontok 11mm Dovetail to 21mm Upgraded Build-in Locking Screws Picatinny Rail Low Profile Scope Mount Converter Base 3/8" to 7/8" Converter - **How much does it cost?** 418350₫ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/517372141-bontok-11mm-dovetail-to-21mm-upgraded-build-in-locking-screws) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Lock & Load with Confidence:** Triple built-in locking screws ensure rock-solid attachment—no wobble, no slip, just pure stability. - • **Zero Recoil Slide Protection:** Integrated recoil stop-pin locks your mount in place, preserving zero even under heavy recoil. - • **Expanded Mounting Real Estate:** 9-slot, low-profile 3.94-inch rail with 0.59-inch saddle height offers ample space for all your tactical optics and accessories. - • **Aircraft-Grade Aluminum Durability:** Precision-machined from solid aircraft aluminum alloy with a sleek black matte anodized finish for rugged, lightweight strength. - • **Seamless Dovetail to Picatinny Conversion:** Effortlessly upgrade your 11mm dovetail to a versatile 21mm Picatinny rail for ultimate optics flexibility. ## Overview The Bontok 11mm to 21mm Picatinny Rail Adapter is a precision-engineered, aircraft aluminum mount converter designed to transform standard 11mm dovetail rails into versatile 21mm Picatinny rails. Featuring a 3.94-inch length with 9 slots, triple locking screws, and a recoil-resistant stop-pin, it ensures a secure, zero-retention optics setup ideal for air rifles and small arms. ## Description Product description Upgraded 9 Slots Aluminum Dovetail to Picatinny Rail Adapter Upgraded Build-in Screws: More Stable, Ensure a Solid Mount to Lock up. Three high strength build-in locking screws of side ensure a solid mount to lock up on rail. Recoil resistant stop-pin on the top provides in additional zero retention against recoil force to prevent the adapter from sliding. Review: Exactly what I expected - Good quality; fits precisely and solidly on my dovetail; allows the Picatinny rail to readily accept the sight mounts. Review: Worked great, after a little custom fitting - I purchased this with the intent of modifying it to fit on a 760 Pumpmaster pellet gun. Since it had a rounded receivers, and since you cannot put any clamping force on the rear section of the receiver, doing so clamps the BB loading tube closed so no BBs can go into it. This mount was hopefully going to clamp only on the front rail and not touch the rear at all. First thing necessary is to use a good size rat-tail file to make a suitable concave run in the bottom of the mount with a contour matching the contour of the top of the 760 receiver. Next, file the bottom rear corners off so that the do not touch the front of the rear receiver dovetail. Only need to take a little off there. With that done this mount fits snugly and now has a Millet red dot on it. I only used the front and middle screws on the mount. I put the rear one in but for looks only, the front and middle screws are more than sufficient to hold the red dot on a BB/pellet gun. Well worth the effort. This combination is giving me BB groups at 20’ less than a dime. Why 20’, it’s a BB gun, not my 1600fps high end pellet rifle. So, if you have a rounded top BB/pellet rifle/gun, and want to put a scope or red dot on it, and am a little handy with a file I highly recommend this base over the bases that have only two clamping screws. ## 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 | #4,927 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #3 in Sporting Optics Mounts | | Brand Name | Bontok | | Color | Black | | Customer Reviews | 4.7 4.7 out of 5 stars (1,345) | | 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 ![Bontok 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) ![Bontok 11mm Dovetail to 21mm Upgraded Build-in Locking Screws Picatinny Rail Low Profile Scope Mount Converter Base 3/8" to 7/8" Converter - Image 2](https://m.media-amazon.com/images/I/51hP44eac3L.jpg) ![Bontok 11mm Dovetail to 21mm Upgraded Build-in Locking Screws Picatinny Rail Low Profile Scope Mount Converter Base 3/8" to 7/8" Converter - Image 3](https://m.media-amazon.com/images/I/61vJ8P2bGaL.jpg) ![Bontok 11mm Dovetail to 21mm Upgraded Build-in Locking Screws Picatinny Rail Low Profile Scope Mount Converter Base 3/8" to 7/8" Converter - Image 4](https://m.media-amazon.com/images/I/61GCLwstfCL.jpg) ![Bontok 11mm Dovetail to 21mm Upgraded Build-in Locking Screws Picatinny Rail Low Profile Scope Mount Converter Base 3/8" to 7/8" Converter - Image 5](https://m.media-amazon.com/images/I/51vsAZaijoL.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 ### ⭐⭐⭐⭐⭐ Exactly what I expected *by P***D on April 7, 2026* Good quality; fits precisely and solidly on my dovetail; allows the Picatinny rail to readily accept the sight mounts. ### ⭐⭐⭐⭐⭐ Worked great, after a little custom fitting *by H***L on April 19, 2026* I purchased this with the intent of modifying it to fit on a 760 Pumpmaster pellet gun. Since it had a rounded receivers, and since you cannot put any clamping force on the rear section of the receiver, doing so clamps the BB loading tube closed so no BBs can go into it. This mount was hopefully going to clamp only on the front rail and not touch the rear at all. First thing necessary is to use a good size rat-tail file to make a suitable concave run in the bottom of the mount with a contour matching the contour of the top of the 760 receiver. Next, file the bottom rear corners off so that the do not touch the front of the rear receiver dovetail. Only need to take a little off there. With that done this mount fits snugly and now has a Millet red dot on it. I only used the front and middle screws on the mount. I put the rear one in but for looks only, the front and middle screws are more than sufficient to hold the red dot on a BB/pellet gun. Well worth the effort. This combination is giving me BB groups at 20’ less than a dime. Why 20’, it’s a BB gun, not my 1600fps high end pellet rifle. So, if you have a rounded top BB/pellet rifle/gun, and want to put a scope or red dot on it, and am a little handy with a file I highly recommend this base over the bases that have only two clamping screws. ### ⭐⭐⭐⭐⭐ Great product! *by J***E on April 18, 2026* This part saved me from an expensive gunsmith bill. Worked great! ## 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 - CVLIFE 1X22X33 Red Green Dot Gun Sight Scope Reflex Sight with 20mm Rail - Feyachi Reflex Sight - Adjustable Reticle (4 Styles) Both Red and Green in one Sight! --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vn/products/517372141-bontok-11mm-dovetail-to-21mm-upgraded-build-in-locking-screws](https://www.desertcart.vn/products/517372141-bontok-11mm-dovetail-to-21mm-upgraded-build-in-locking-screws) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-05-23*