Will this fit a CZ 457?

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.

Will this work for gamo magnum g2 or maxxus g2?

Don’t know but it is 15mm bottom and 20mm top I use it on a crossbow

Has anyone got this to fit on a Ruger break barrel air rifle? The top of the dovetail is curved, not flat.

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

Will it mount a 20mm red dot ?

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.

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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

Product ID: 279432752

📏3.94-inch extended Picatinny rail

🔩3 high-strength locking screws

⚙️Precision aircraft-grade aluminum

€ 35.24

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Description

🔧 Elevate your optics game with precision and style — don’t get left behind!

PRECISION STABILITY - Three locking screws and a vertical stop pin ensure rock-solid, shake-free mounting every time.
LOW PROFILE RISER DESIGN - Sleek 0.59-inch height keeps your setup streamlined without sacrificing accessory compatibility.
SEAMLESS RAIL CONVERSION - Effortlessly converts 11mm dovetail mounts to versatile 21mm Picatinny rails, expanding your optics options.
AIRCRAFT GRADE DURABILITY - Crafted from premium aluminum alloy with matte black anodized finish for rugged, long-lasting use.
TOOL ASSISTED INSTALLATION - Includes an Allen wrench for quick, secure fitting—get your gear battle-ready in minutes.

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-inch riser and 9-slot design over a 3.94-inch length, it offers versatile optics placement with secure, shake-free installation via three locking screws and a vertical stop pin. Ideal for professionals seeking durable, flexible mounting solutions.

Specifications

ASIN	B08SC867NL
Best Sellers Rank	#7,719 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #4 in Sporting Optics Mounts
Brand Name	LONSEL
Color	Black
Customer Reviews	4.5 4.5 out of 5 stars (3,350)
Date First Available	January 7, 2021
Item Package Dimensions L x W x H	5.94 x 3.27 x 0.71 inches
Manufacturer	LONSEL
Package Weight	0.14 Kilograms
Style	2 PACK - 9 Slots

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€ 35.24

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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Excellent communication throughout the order process. Product is perfect.

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