Bobro Engineering has released a new offset red dot sight mount called A-BOM (Adjustable BOre axis Mount) that allows adjusting the reflex sight’s angle to align its axis with the bore axis of the host firearm. The adjustments are possible thanks to a center link between the Picatinny rail mount and the red dot mount which can also be removed converting the A-BOM to a conventional red dot mount.
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Here is how the company describes the advantages of the A-BOM mount:
Most offset mounts do not account for the bore axis of the host weapon, and severely limit the capabilities of sight utilization. If the sight is not set on bore axis, the user is limited to a set zero distance, and any deviation from this point of aim/impact will introduce left and right corrections along with a simple elevation change. The A-BOM, once set, only introduces elevation changes to account for, and follows the function of the primary optic. For example, the A-BOM can be zeroed for 10 meters, but be utilized accurately at hundreds of meters. Only intuitive elevation changes are made.
In order to align the red dot sight attached to the A-BOM mount with the bore axis, the manufacturer suggests inserting an L-shaped Allen key into the bore (3/16 is perfect for 223/5.56 barrels) and simply aligning the dot with the protruding end of the Allen key. This doesn’t sound like a really precise method, however, Bobro Engineering claims that shots out to distance were made with this installation procedure with no fine tuning required.
The MSRP of the Bobro Engineering A-BOM adjustable bore axis red dot mount is $240. It is currently available with a Trijicon RMR mounting plate only.
Pictures by Bobro Engineering, www.bobroengineering.com