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Questions & Answers
It shows the weight is 1lb ? Expert Answer

That is the weight listed by the manufacturer, but our internal weight shows .11 lbs or around 1.75 ounces.

by Armando R., Gear Expert, June 27, 2019
Any issues with the bubble part of this level sagging because of the hinge, unlike the less-expensive version, which does not have this feature? Expert Answer

Sagging? No - the tolerances are very tight for this product.

If it's a concern for you, Nightforce makes this product, but it is only compatible with specific Nightforce rings:
https://www.opticsplanet.com/nightforce-top-half-of-ring-with-level.html

Mark H.

by Mark H., Gear Expert, May 31, 2018
Customer Reviews
Helpful Positive Review Slim line and easy to install by Legacy Reviewer, Verified Owner, March 27, 2010
Slim line and folds away nicely. I can barely tell its under my scope. Becareful not to over tighten, I did and it caused a cmall crack on the screw. Pros: Fits under scope, folds away, easy to install Cons: Don't over tighten!
4/5 found this helpful
Helpful Positive Review Very Nice, Very Expensive by CC, Verified Owner, September 8, 2020
All around really nice folding bubble level, but crazy expensive for what it is. The cap is very easy to lose too. Easily installed. Easy to see on gun. If you use levels a lot and have the cash to blow, this is one of the best.
2/2 found this helpful
Helpful Positive Review Best Bubble Level! by Eric, September 16, 2018
Put it anywhere on your tail; fold it away when not in use. It’s easy to see and a must for target shooters and hunters. I’d recommend this item to any serious shooter for accuracy! A little on the expensive side but well worth the extra bucks.
1/1 found this helpful
Helpful Positive Review So far so good by Pharmer479, March 11, 2018
A much faster setup than the newer vortex anti-cant device. Not as bright as I was hoping for. Waiting for a field test. A little difficult to see at night. Folding feature is absolutely worth getting to prevent snagging.
1/1 found this helpful
Helpful Positive Review US Optics Rail mounted bubble level by Legacy Reviewer, Verified Owner, April 10, 2011
The device is well made, and works just as you would expect. The swivel is worth the extra money because otherwise, unless the level is removed after shooting, it is only a matter of time until the fixed level is accidentally broken off. It is wort...
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6/6 found this helpful
Helpful Positive Review Simply and Effective by LongSpur, August 4, 2018
I can honestly say this simple bubble level has been very useful in properly mounting optics. It is important to start the process with a level weapon and this gets the job done on the fly. This item is well built and rugged. Although pricey I do rec...
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1/1 found this helpful
Read All 54 Reviews
Color: Black Finish: Type III Hard Anodized Size: One Size Gun Type: Universal Gun Make: Universal Gun Model: Universal Length: 3.23 inHeight: 0.649 inCondition: New

Code: XP-RA-BBLSwivel-BBL-300

MPN: BBL-300

UPC: 811069020157

List: $110.00Save $5.50
$104.50

Product Info for U.S. Optics Rail Mounted Swivel Bubble Level

US Optics Ext Cant Indicators with Swivel Bubble Level available for Picatinney or Weaver (Rail Mounted Style) and 30mm Rings (Ring Mounted). Screw on cover protects glass vial from damage when not in use. Those Rifle Scope Ext Cant Indicators by U.S. Optics include cover. USO Rail Mounted Swivel Bubble Level Ext Cant Indicator (Contoured) attaches to your Picatinny Base. U.S. Optics Ring Mounted Swivel Bubble Level Ext Cant Indicator attaches to your 30mm scope tube. Screw on cover of those USOptics Ext Cant Indicators protects the glass vial from damage when not in use. Level folds away 90 degrees when not in use. Made from 6061-T6 and Type III Hard Black Anodized.image

We offer a complete line of US Optics Rifle Scope Mounts, Rings and Bases. For our complete selection of products by U.S. Optics on sale please visit our US Optics page. For more Rifle Scope Mounts, Rings and Bases please visit our Rifle Scope Mounts, Rings and Bases store section.

Specifications for U.S. Optics Rail Mounted Swivel Bubble Level:

Manufacturer: U.S. Optics
Color: Black
Finish: Type III Hard Anodized
Fabric/Material: 6061-T6 Aluminum
Size: One Size
Gun Type: Universal
Gun Make: Universal
Gun Model: Universal
Length: 3.23 in
Width: 0.618 in
Height: 0.649 in
Weight: 1 lb
Condition: New
Gun Rail: Picatinny

Features of US Optics Rail Mounted Swivel Bubble Level:

  • Manufactured from 6061-T6 Aluminum and then Type III hard anodized for durability
  • Comes with a screw on vial cover to protect the level during storage that can be screwed on the other end when in use for safe keeping
  • Mounts to all 1913 Picatinny rails

Package Contents:

  • U.S. Optics Rail Mounted Swivel Bubble Level

U.S. Optics Rail Mounted Swivel Bubble Level Orderable Models

List of Orderable Models

U.S. Optics Rail Mounted Swivel Bubble Level, Matte Black, Small, BBL-300 , MPN: BBL-300 , UPC: 811069020157 , Code: XP-RA-BBLSwivel-BBL-300

U.S. Optics Rail Mounted Swivel Bubble Level Unavailable & Discontinued Models

List of Unorderable Models

USED U.S. Optics Rail Mounted Swivel Bubble Level, Matte Black, Small, BBL-300, EDEMO2, Used, Condition Fair , MPN: BBL-300-EDEMO2 , Code: XP-RA-BBLSwivel-BBL-300-EDEMO2
US Optics Ring Mounted Swivel Bubble Level, Matte Black, BBL-400 , MPN: BBL-400 , Code: XP-RA-BBLSwivel-BBL-400
US Optics Rail Mounted Swivel Bubble Level, 11mm, Matte Black, BBL-350 , MPN: BBL-350 , Code: XP-RA-BBLSwivel-BBL-350
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