Search  for anything...
LONSEL

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

  • Based on 3,405 reviews
Condition: New
Checking for the best price...
$6.98 Why this price?
Labor Day Deal · 61% off was $17.97

Buy Now, Pay Later

As low as $1 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Sunday, Sep 6
Order within 5 hours and 32 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Style Name: 1 PACK - 9 Slots


Features

  • Precision Material: Premium out of aircraft grade aluminum alloy and black hard coat anodize finish, sturdy & durable.
  • Convert 11 mm Dovetail to 21 mm Picatinny Rail: 2.94 inches length at the base, the picatinny rail extends 3.94 inches allowing for more flexible optics placement.
  • Mount Base: Fit 11 mm dovetail mounts, Base mount 3/8" to 7/8" converter adapter. Low profile 0.59" riser rail for scope.
  • Top With 9 Slots Style Rail: Top 21mm picatinny rail allows for the mounting of picatinny standard scopes, red dots or other accessories.
  • Easy To Install: Rail adaptor installs easily via dovetail mount and one vertical stop pin, attached allen wrench can help you to tight stable and no shaking.

Description

Lightweight & Durable ｡◕‿◕｡Precision Machined from aircraft grade aluminum and finished in a matte black hard coat anodize, durable solid structure. 11mm To 21mm Rail Convert Adapter ｡◕‿◕｡Compatible with 11mm or 3/8" dovetail mounts, can be used to convert to 21mm picatinny rail mount. Low Profile Riser Rail Design ｡◕‿◕｡ 3.94"/100mm length single picatinny rail with 9 Slots with a 0.59" saddle height riser rail. ｡◕‿◕｡ 4.72"/120mm length single picatinny rail with 11 Slots with a 0.59" saddle height riser rail. Easy to Install ｡◕‿◕｡Three high strength locking screws ensure a solid mount-to-receiver lock up, attached allen wrench can help you to ensure tight enough, keep stable and no shaking.

Item Package Dimensions L x W x H: ‎5.83 x 3.15 x 0.75 inches


Package Weight: ‎0.06 kg


Brand Name: ‎LONSEL


Color: ‎Black


Material: ‎Aluminum


Manufacturer: ‎LONSEL


Style: ‎1 PACK - 9 Slots


Date First Available: June 28, 2021


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Sep 6

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Excellent Little Adapter That Solved My Mounting Problem
Style Name: 1 PACK - 9 Slots
I bought this adapter so I could mount a Picatinny red dot sight on my pellet pistol, which only came with an 11mm dovetail rail. I wasn't sure what to expect at this price point, but this little adapter exceeded my expectations. Installation was quick and straightforward. It fit the dovetail rail perfectly, tightened down securely, and provided a solid Picatinny platform for my optic. Once everything was mounted, there was no noticeable movement or wobble, and my red dot held zero without any issues. The machining is surprisingly nice for such an inexpensive part. It feels sturdy, the finish looks great, and it doesn't look or feel like a bargain-bin accessory. What impressed me most was the value. For just a few dollars, it completely expanded my mounting options and allowed me to use the optic I already owned instead of buying a different sight. That's a huge upgrade for very little money. If you have a pellet gun, air rifle, or firearm with an 11mm dovetail rail and want to mount Picatinny accessories, this adapter is an easy recommendation. It fit perfectly, worked exactly as advertised, and turned out to be one of the best values I've purchased. Highly recommended! ... show more
Reviewed in the United States on August 3, 2026 by Rob W
    • Nice conversion for Weaver to Picatinny. Easy to install.
Style Name: 1 PACK - 9 Slots
Works well on a Winchester 190 to put a small red dot on it. Seems well made and had no problems holding zero.
Reviewed in the United States on August 1, 2026 by HRW
    • Perfect for dovetails
Style Name: 1 PACK - 11 Slots
Must have for adding new sights. Fits great and easy install. Still holding strong and holding zero for scope.
Reviewed in the United States on August 22, 2026 by James m
    • 22 Rail receiver scope base mount adapter 11mm to 21mm Picatinny.
Style Name: 2 PACK - 11 Slots
Older model 22 rim fire grove was v-cut into the receiver with Round over remaining, not flat. Your adapter should have a relief cut for round receiver, C-cup. Other wise your LONSEL adapter ok. Adjustability ok, Quality ok, ease to use ok, durability ok. Price ok. Fit Installation needs round receiver application, will you make one for my older 22 rifle Mossberg purchased new 1968. Want to mount night vision scope with built in rings for Picatinny. ... show more
Reviewed in the United States on April 27, 2026 by WVJ's
    • Tight and Right!
Style Name: 2 PACK - 11 Slots
Outstanding product. It fit precisely as it should have.
Reviewed in the United States on July 29, 2026 by Bookumcard
    • Perfect
Style Name: 1 PACK - 9 Slots
Perfect fit. Less than 5 minutes to install
Reviewed in the United States on July 5, 2026 by Peter Walker
    • Good price.
Style Name: 1 PACK - 9 Slots
Works as it should.
Reviewed in the United States on June 27, 2026 by YAS
    • Nice Quality
Style Name: 1 PACK - 9 Slots
Good quality and fit
Reviewed in the United States on August 18, 2026 by Michael M

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...