MBS-AA Borelight

Laser Boresight for Rifles, Carbines, Submachine Guns and Pistols

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Quality engineered for a flawlessly centered dot every time, the MBS-AA Borelight provides a precise, accurate alignment in the field without firing a single round of ammo.

  • Visible red laser
  • Weight 5.4 oz.
  • Submersible to 3 meters
  • Item No. 9090

Available from Steiner for: 

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Product Features: 

Low Power Mode for Low Light Conditions
Stainless Steel Bore Rods (2) Fully Adjustable for Windage / Elevation Rotary Switch for Easy Operation
Powered by One AA Battery
Includes Arbors for these Calibers:
    ⁃    .22/.223/5.56mm Oversize
    ⁃    .223/5.56mm
    ⁃    7mm
    ⁃    .30/.308/30-06/7.62mm
    ⁃    .38/.357/9mm
    ⁃    .40/10mm/.45/.50


Item No.Case ColorLaser ColorVisible LaserIR PointerIR IlluminatorRestricted
9090BlackRedVisible Red LaserN/AN/AN/A
Wavelength - Visible Red Laser635 nm
Beam Divergence - Visible Red or Green Laser
Range/Visibility (Night/Day)* - Visible Red Laser250 m
Temperature-40° to +65° C
Battery1 AA
Battery Life (mode dependent)8 hours
MaterialAircraft Aluminum
Weight (with battery)5.4 oz
Dimensions9.25 L
WaterproofSubmersion to 3 m
Activation SwitchRotary Switch
Special FeaturesSupplied with arbors for most carbine, rifle, submachine gun and pistol calibers

MBS-AA Borelight is rated 5.0 out of 5 by 1.
Rated 5 out of 5 by from Easy to use very well made boresight. Extremely well made boresight. It takes a normal battery and lasts. I went through multiple boresights before finally purchasing the Steiner and every time I went to use them the batteries would be dead and required batteries that cost as much as the boresights and extremely hard to find. Save yourself the trouble and frustration of going to sight your gun in only for batteries to be dead or go dead while using it and just go ahead and spend the money to buy a quality American made product that is backed by a trusted company and built to withstand whatever you put it through or waste your money on batteries and ammo you could have saved by just purchasing a high quality boresight.
Date published: 2017-04-19
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Any plans to offer a 17 caliber or 0.177" boresight "spud" or arbor in the future?

Asked by: BugBug
We have no plans for new sizes at this time.
Answered by: SteinerOptics3
Date published: 2020-12-04

Hello! I am told by the distributors that the MBS-AA 9090 Boresite is discontinued. What is the replacement model number?

Asked by: Amber

How do I replace bent arbors for this boresight. I have emailed customer service and after some time they replied with only a link to the binocular parts website that does not have anything about the arbors anywhere on it.  

Asked by: Akek
My apologies for you being directed to a site, which didn't help you. We don't sell spare arbors for the MBS-AA Borelight. We only sell them as part of the system.
Answered by: Steiner eOptics 1
Date published: 2020-11-07

Has this product been discontinued?  If, yes, will there be a replacement?

Asked by: Golfman
This product has not been discontinued.
Answered by: Steiner eOptics 1
Date published: 2020-11-06

Do the previous answers suggest that you do not offer replacement parts in the event of loss/damage and that you do not plan to expand the line for different calibers or shorter barrel lengths?

Asked by: challer
Hello, The Boresight comes with a warranty, and we will absolutely service them. If you have issues with one, or questions please feel free to contact us! https://www.steiner-optics.com/product-warranties
Answered by: Steiner Tech Support
Date published: 2020-11-06

Is this still available in the USA. All the sites I check say discontinued.

Asked by: PaulieV
They are discontinued.
Answered by: Steiner Tech Support
Date published: 2021-09-30

Are bore studs for other calibers????

Asked by: Bigun
Includes Arbors for these Calibers: ⁃ .22/.223/5.56mm Oversize ⁃ .223/5.56mm ⁃ 7mm ⁃ .30/.308/30-06/7.62mm ⁃ .38/.357/9mm ⁃ .40/10mm/.45/.50 Unfortunately, there are no other arbors available at this time
Answered by: SteinerOptics3
Date published: 2020-12-04

what do you mean for 9,25 L as dimensions?

Asked by: tarik
The length of 9.25" for the MBS-AA Borelight on the website, is the total length of the laser head, with the rifle guide rod attached to the laser. The rifle guide rod is 6.125" long, and the pistol guide rod is 3.25" long.
Answered by: Steiner eOptics 1
Date published: 2020-12-04
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