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

🔩Secure 3-screw locking system

⚙️Precision aircraft-grade aluminum

102.58 DT

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔫 Elevate your optics game—convert, mount, and dominate with precision!

EXTENDED FLEXIBILITY - 3.94-inch Picatinny rail with 9 slots offers versatile optics placement—perfect for scopes, red dots, and tactical accessories.
ROCK SOLID STABILITY - Triple high-strength locking screws and included Allen wrench ensure zero-shake, zero-wobble performance under recoil.
EFFORTLESS INSTALLATION - Tool-assisted dovetail mount with vertical stop pin makes setup quick and secure—no gunsmith required.
ENGINEERED FOR PRECISION - Crafted from premium aircraft-grade aluminum with a matte black hard coat anodize finish for unmatched durability and sleek stealth.
LOW PROFILE RISER DESIGN - Only 0.59 inches tall, this riser rail maintains a sleek profile while optimizing eye relief and mounting height.

The LONSEL Dovetail to Picatinny Rail Adapter converts 11mm dovetail mounts to a 21mm Picatinny rail, extending your mounting options with a durable, low-profile 0.59-inch riser. Precision-machined from aircraft-grade aluminum with a matte black anodized finish, it features a 3.94-inch rail with 9 slots for flexible optics placement. Easy to install with a secure 3-screw locking system and included Allen wrench, this adapter ensures stable, shake-free performance for professional-grade scope setups.

Specifications

ASIN	B08SC867NL
Best Sellers Rank	#4,877 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #5 in Sporting Optics Mounts
Brand Name	LONSEL
Color	Black
Customer Reviews	4.5 4.5 out of 5 stars (3,444)
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 kg
Style	2 PACK - 9 Slots

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TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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102.58 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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