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BKL 257 3/8" & 11mm Dovetail Rimfire Airgun Rifle Scope 1"/25mm Mount Rings

BKL 257 3/8" & 11mm Dovetail Rimfire Airgun Rifle Scope 1"/25mm Mount Rings

Stock Status: In Stock
0.774" / 19.6mm from base to ring bottom. Maximum scope outer case diameter 64mm. For 1" / 25mm diameter tube scopes. Upto medium recoil. Best 3/8" and 11mm dovetail mounts at this price level my miles.
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BKL 257 3/8" & 11mm Dovetail Rimfire Airgun Rifle Scope 1"/25mm Mount Rings - High profile

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

High profile 2 piece mount rings for 25mm / 1 inch tube scopes for fitting on 3/8" and 11mm airgun and rimfire dovetail base rails.

Height - 0.774" - 19.6mm base to bottom of ring equates to maximum scope outer objective casing diameter of 64mm - this equates to fitting scopes with 40-50mm lens size depending on how much diameter the outer casing adds, use of flip up caps etc.

See Clearance guide down page for an in depth guide to how to figure the fit.

  • Tube diameter: 25mm / 1 inch
  • Fits: 3/8" and 11mm dovetail grooves
  • Overall Length: 0.60" - 15mm
  • Clamp Length: 0.60" - 15mm
  • Ring Width: 0.60" - 15mm
  • Bottom of Mount to bottom of Scope Tube: 0.774" - 19.6mm
  • Weight: 3.1 oz - 86g
  • Finish: Matte Black
  • This item sold as a set of 2 mounts
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.

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 required - the measure from base of mount to bottom of the ring - 19mm in this case

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.  The saddle on these mounts is -

Example -

  1. A 40mm objective lens scope (a Hawke Vantage 3-9x40 AO is about this) is measured and found to have an outer case measurement of 54mm.
  2. 54 divided by 2 = 27
  3. 1" scope so deduct 12.7mm = 14.5mm
  4. So the mount must have a saddle measure (base of mount to bottom of the ring) greater than 14.5mm or else it will ground out on the rifle body.
  5. As we have 19.6mm to play with here it will be a good fit with 5.1mm clearance.
NB - Hawke Vantage example - ideal for the 40mm lens AO scopes and Vantage 50mm NON AO but too short for the 50mm lens AO Vantage models that are 64mm outer...unless on a raised base etc.

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.

BKL customer user reviews
Used a set of these to mount my Mueller Tactical 8.5-25x40mm scope. Perfect height when used to attach the scope to my vintage, 1966 Browning T-Bolt .22 or Kimber model 82 Government.

I ordered a set of BKL rings to try them after reading good reviews on RFC. I was so happy with them that I just got 2 more sets to replace the rings on my Marlin 883 and Savage MK2. You won`t find a better set of rings for your rimfire rifles than BKL.

This is my second set as the first set was the .977 tall ring. This time I ordered this shorter height to go with the risers to get me to 1.43 inches in height w/o going over 1.50 inches for competition. The BKL rings are mounted on my CZ 452 American and now have arrived at the perfect height I need for my body frame. The aligning of these rings on the receiver is incredible. BKL rings and risers are solid as a rock.

I have mounted 5 sets of the BKL-257 rings on our CZ 452 rifles. They are very good rings and are very well made. The rings fit both 11mm and 3/8" mounting system on the CZ rifles very well. The rings mount very solid. I will use them again.

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.

  • MPN:
  • Height:
    19.6mm / 0.774"
  • Brand:
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  • Weight:
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