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3/8" 9-11mm Dovetail - Weaver/Picatinny adapters

The majority of airguns and rimfire rifles and many shotguns come with 3/8" or 9-11mm width dovetail grooves on top. This is all very well and mounting scopes is no problem, there are lots of mount rings to suit.

But what if you want to use products that can only fit a 20-22mm weaver/picatinny mil type base? After all there are loads of great products only suitable for this type of base, such as super strong tactical mount rings to multi rail bases, dot sights, torches and lasers.

Many scopes, especially USA market focus models also come with pre-packaged high quality weaver type mounts and it's a shame to waste them.

This is where this dovetail to weaver base adapter section comes in. Here you can find various converters to put on to a airgun and 3/8" dovetail base and get that weaver/picatinny base you need.

Take care to pick the correct base type. Some of them only fit 11mm or only 3/8" while some fit both. (Exceptions- BKL400 series for 14mm rails)

Please ask us if unsure, returns cost us all and only the post companies like them!
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Showing products 1 to 20 of 20
Leapers Airgun/Rimfire 9-11mm Dovetail to 2pc snap in Picatinny Adaptors (Pair)

Pair - Superb and simple snap in adapter bases that let you use weaver/picatinny mounts on rifle 9mm-3/8" and 11mm dovetail bases

£14.95
£12.46 (ex. VAT)
Hawke 1 Piece Adapter 3/8" Rifle to Weaver Base & 40 MOA Elevation Ext - 22404

Converts 3/8" dovetail to 20mm weaver base + 40 MOA and 11mm height riser

£21.95
£18.29 (ex. VAT)
Hawke 2 piece 3/8"mm Dovetail Base to Weaver/Picatinny base Adapters low profile - 22405

Turn any 3/8" base into a weaver 20mm width. Not for 11mm dovetail or true mil spec picatinny spec crossbars

£19.95
£16.63 (ex. VAT)
Hawke 2 piece 3/8" or 11mm Dovetail Base to Weaver Adapters - Extended - 22400

Converts 11mm and 3/8" dovetail to 20mm weaver base + 11mm height riser

£21.95
£18.29 (ex. VAT)
LEAPERS 3/8" - 11mm Airgun/.22 to Picatinny/Weaver Rail Adaptor - MNT-PMTOWL

A base adapter you fit on standard 3/8"rifle and 11mm width airgun bases to make it into a 20mm weaver base so you can use weaver mount rings

£12.95
£10.79 (ex. VAT)
Hawke 1 Piece Adapter 3/8" to Rifle Weaver Base & 40 MOA Elevation HM17021/22403

Converts 3/8" dovetail to 20mm weaver base + Adjust upto 40 MOA and 11mm height riser

£20.95
£17.46 (ex. VAT)
Hawke Adapter 3/8" & 11m dovetail to Weaver Base & 11mm riser Extended rail - HM17015 / 22401

Converts 3/8" and 11mm dovetails to 20mm weaver base + 11mm height riser

£22.95
£19.13 (ex. VAT)
Hawke Adapter 3/8" & 11m dovetail to Weaver Base & 11mm riser Extended top rail 22402

Converts 3/8" and 11mm dovetail to 20mm weaver base + 11mm height riser and extended rail top

£21.95
£18.29 (ex. VAT)
BKL 456 14mm Dovetail to Picatinny Adapter Base Riser

14mm Dovetail to Picatinny Adaptor and Riser Mount. Rails such as BSA Maxigrip/Lightning, Beeman P1, HWs' Haenel Model 303 .22. Do not fit BSA 13mm

£31.95
£26.63 (ex. VAT)
BKL 554 OFFSET 3/8" 11mm Dovetail to Weaver/Picatinny Base Adaptor and Riser

Length 100mm with 42mm clamp length. Height add 17.5mm with height 13mm base to underside of base

£39.95
£33.29 (ex. VAT)
BKL 558 3/8" 11mm Dovetail to Weaver/Picatinny Base Adapter and Riser for BOLT ACTION rifles

Length 100mm. Total height addition 17.5mm. Port clearance height 13mm

£52.95
£44.13 (ex. VAT)
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BKL 568 1 piece 6 screw 3/8" 11mm Dovetail to Weaver/Picatinny Base Adapter and Riser

Note - may not fit 1 piece true mil spec picatinny mounts as the slot spacing is not mil spec. Fine for any 2 piece mount though.

£52.95
£44.13 (ex. VAT)
BKL 568 1 piece 6 screw 3/8" 11mm Dovetail to Weaver/Picatinny Base Adapter Riser - Used

Note - may not fit 1 piece true mil spec picatinny mounts as the slot spacing is not mil spec. Fine for any 2 piece mount though. This unit is a return due to the issue described and has some tiny marks on it so is on sale reduced 20% off

£41.95
£34.96 (ex. VAT)
Britannia Rails CZ455 20 MOA Picatinny Rail

Model 1-0018

£79.95
£66.63 (ex. VAT)
Britannia Rails Universal 11mm to Picatinny Rail Adapter Cantilever 3-0002

Superbly engineered 11mm to true mil spec picatinny adapter for air rifles and rimfire. 148mm long, mount base 56mm

£138.95
£115.79 (ex. VAT)
Britannia Rails Universal 11mm to Weaver Picatinny Rail Adapter Extended 6-0012

Premium grade engineering produces one of the best 11mm to Mil spec picatinny base adapters on the market for rimfire and air rifles. 188m length with 115mm mounting length

£139.95
£116.63 (ex. VAT)
PAO 11mm to Weaver Picatinny Base Spring Snap-in Low Profile Rail Adapter

SOLD AS SINGLE UNITS. Easy fast 11mm - weaver picatinny snaps in, same idea as the Leapers UTG ones

£6.95
£5.79 (ex. VAT)
Weaver 2pc Base Rail Scope Mount Adapter for Ruger American Rimfire - 48012

Also suits Marlin 980 & various Remington, Stevens, Winchester & Mossberg

£19.95
£16.63 (ex. VAT)