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BKL 300 Series 30mm rings

BKL388 30mm 120 MOA Adjustable 1 Piece 3/8"-11mm Airgun .22 Dovetail Rifle Scope Mount

Huge 120 MOA adjust range
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BKL 388 30mm tube Adjustable 1 Piece Airgun .22 rimfire 9-11mm Dovetail Rifle Scope Mount

Top quality, made in the USA mount rings for airgun and rimfire rifles.

The BKL Adjustable Mount System is a significant improvement over traditional adjustable scope mounts available on the market today; this design incorporates side rails for mounting additional shooting accessories, a lower profile than usually achievable in an adjustable mount, 2.5 inches of clamping length with six clamping screws

Massive 120 MOA range Adjustable = Ideal for situations where the scope has run out of elevation or for barrel droop situations on rifles like RWS Dianas


Saddle Height - 0.825" - 21mm base to bottom of ring equates to maximum scope outer objective casing diameter of 71mm - Most scope outer casing add 7-15mm to the lens size (depending on things like if it is an AO scope, use of flip up caps etc) so this gives a lot of room.

Generally these mounts are best suited for scopes with 44-56mm lenses though in some circumstances they are useful for smaller scopes such as NV applications, needing to clear iron sights, magazines, bolt actions etc. See Clearance Guide below or ask if unsure.


  • Scope Tube Diameter: 30mm
  • Mount Rail:  3/8" and 11mm
  • Mount Type:  One Piece
  • Mount Height:  High
  • Finish:  Matt Black
  • High performance CNC machined aluminium
  • Patented clamping system

Technical Specs:

  • Overall Length: 4.0" 102mm
  • Clamping Length: 2.5" 64mm
  • Ring Width: 0.6" 15.2mm
  • Turret Clearance: 0.180" 4.5mm
  • Weight: 4.5oz 126 grams
  • Bottom of Mount to Bottom of Scope Tube: 0.825" / 21mm
  • 11mm dovetail side rails
  • Side rails also include screw threads for screw in bubble level fitting
Manufactured from aircraft grade aluminium on state of the art CNC machinery in Texas, USA

What are the advantages of BKL mounting systems?
1 - Installation is performed easily because there are few components to contend with. BKL uses the same #8-32 screws for both scope ring and base clamps. One 9/64 hex wrench tightens all.
2 - The inside diameter where the rings clamp together is radiused to prevent scope damage.
3 - BKLs clamping system self aligns as it tightens down on 3/8” and 11mm dovetails.
4 - No lapping required.

Do I have to center BKL scope mounts?
No. All of our products center up as the pressure from the clamping system pulls down as it clamps in.

Clearance Guide - Calculating scope to rifle body clearance

The way you calculate the clearance is by halving the overall OUTSIDE diameter of your rifle scopes objective lens and then deducting half the rifle scopes body tube diameter.

For scopes with a 1" diameter body tube diameter this would mean deducting 12.7mm and 15mm for scopes with a 30mm diameter body tube.

Note we say OUTSIDE diameter - this means NOT the lens diameter, you need to measure the whole outer casing diameter.

The result gives you the minimum "saddle" dimension - the measure from base of mount to bottom of the ring.

The amount the saddle dimension is greater than the figure you have calculated is the amount of clearance your scopes objective will be clear of your rifles body. This mount has a 21mm saddle so the result needs to be less than 21 for it to fit.

Example -

  1. A 30mm tube scope has an outer case measurement of 66mm.
  2. 66 divided by 2 = 33
  3. 30mm scope so deduct 15mm = 18mm
  4. So the mount must have a saddle measure (base of mount to bottom of the ring) greater than 18mm or else it will ground out on the rifle body.
  5. Here we have 21mm so will be 3mm clearance assuming it to be a standard flat base.

Calculating your rifle scopes clearance in this way does assume your dovetail or base is not raised above or below your rifles barrel. Note some rifles with high or adjustable cheek pieces may require higher scope mounts or risers so that your eye is in line with the rifle scope and your head is kept in an upright comfortable position.

About BKL - Made in Texas, USA

BKL Technologies, manufacturer of the largest selection of airgun and rimfire scope mounts in the U.S. Our competition-grade scope mounting system includes scope mounts, scope rings, dovetail to weaver adapters, and scope risers that utilize a quick-installing and self-aligning clamping system that fits both 11mm and 3/8" dovetails.

BKL mounts are compatible with popular rimfire manufacturers such as Anschutz, CZ, Feinwerkbau, Marlin, Remington, Savage, Suhl and air rifle manufacturers such as Air Arms, AirForce, Beeman, Benjamin, BSA, Crosman, Daystate, Diana, Gamo and Webley.

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Brand BKL
Code NW1506
Weight 0.16kg
EAN 814136025123