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Questions & Answers
Do I have to get a tool to spread the rail section? It does not fit a PSA M4 upper out of the pack. Expert Answer

A tool should not be required to install this sight with the exception of the Allen Key for the mounting bolt. Email us at Techsales@opticsplanet.com for assistance.

by Ethan, Gear Expert, January 19, 2023
Will this work with just the standard A2 FSP? Expert Answer

Yes, this sight would be the same height as the A2 front sight.

by Tom B, Gear Expert, September 16, 2021
Customer Reviews
Helpful Positive Review
Much easier to align front sight with this rear sight compared to a normal circle. The white lines also help.
8/9 found this helpful
Helpful Positive Review
Not a folding sight! by LB, Verified Owner, October 22, 2025
I have no clue why this is labeled as a deployable sight. It is indeed a fixed sight. No folding. I returned the sight and bought the folding sight. I just got back from the range. It took some time to get used to this sight. Once I did I found my gr...
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1/1 found this helpful
Helpful Positive Review
Excellent Rear Sight by mountaineer, March 24, 2016
I have used the Troy fixed sights on a couple other rifles and have been very happy but this is the first time I used the Di-Optic aperture... I am very impressed with the large aperture... it is diamond shaped with a vertical and horizontal line on ...
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5/5 found this helpful
Helpful Positive Review
Installation is good. These mount up and zero easily. Fit and finish is very good. They are lightweight, being made out of aluminum. But by being aluminum, they are easily damaged. A garage drop bent the ear of the rear fixed sight inwards significan...
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4/5 found this helpful
Helpful Positive Review
Better than standard peep sights by Get some, December 31, 2022
Awesome sight, much quicker target acquisition than standard prep sight. These are built tough with quality materials. Light weight and come with easy to understand instructions made a quick and simple to install and zero.
2/3 found this helpful
Helpful Positive Review
Great for M4 pseudo clone by bisrael, Verified Owner, August 29, 2019
awesome sight and can't really say much more about it. co witnesses perfectly with my aimpoint PRO and A2 front sight, durable, fit and finish are what you expect from Troy. A++++ if you're going to build an AR you could do a lot worse than this rea...
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2/3 found this helpful
Read All 14 Reviews
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made-in-usa-flag Made in USA

Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Troy Dioptic Apeture DOA Top Mounted Deployable Iron Sight

Troy Rear Di-Optic Aperture (DOA) Fixed BattleSight is on sale and available from our online store. We are an Authorized US Distributor for Troy Weapon Accessories.image

Advanced design, superior sighting and battle-ready toughness define the Troy Di-Optic Aperture (DOA) Fixed Rear BattleSight. This permanent, rail-mounted alternative to a standard A2 sight allows limitless mounting options on all-length rails with a serrated ramp to eliminate glare. Provides a continuous zero, unflinching durability and peace of mind. These sights provide lightning fast target acquisition and are manufactured to exceed military specs. The optically engineered Di-optic apertures center your eyes instantly and effortlessly providing a clearer target picture than with round apertures.

The sights feature two settings, one for up to 300 meters and a second for up to 550 meters. This versatility makes the DOA ideal for military, law enforcement and home defense applications. These advanced sights have been extensively field-tested and, like all Troy Industries products, are Battle Ready.

Note: Sight is designed to work on same plane rail systems only. Will not work with a railed gasblock that is higher or lower than the receiver.

Specifications for Troy Dioptic Apeture DOA Top Mounted Deployable Iron Sight:

Manufacturer: Troy
Color: Black
Additional Features: Dual Aperture, Increases accuracy out to 550m
Sight Mounting Orientation: Top Mounted
Sight Position: Rear
Gun Model: AR-15, M16, M4, AR-10
Gun Make: AR Platform
Front Sight Color: REAR SIGHT ONLY
Rear Sight Color: Black
Front Post Shape: Post
Deployable: Yes
Fabric/Material: Hardened Aircraft Aluminum, Stainless Steel
Front Material: Aluminum
Blade Height: 1.36 in
Rear Blade Height: 1.36 in
Front Blade Height: 1.36 in
Illumination Type: Non-Illuminated
Gun Type: Rifle
Illumination Color: None
Hand: Ambidextrous
Mount Type: Picatinny
Finish: Mil-Spec HardCoat Anodized
Attachment Type: Picatinny
Country of Origin: USA

Features of Troy Rear Di Optic Aperture (DOA) Fixed Battle Sight:

  • Di-Optic Apertures improve sight acquisition speed
  • Increases accuracy out to 550m
  • Exclusive Battle Ready design
  • Installs and adjusts easily
  • Aircraft aluminum 6061 & stainless steel
  • Type III hard coat w/ black oxide or Flat Dark Earth finish
  • Hardened T6 aircraft aluminum construction with stainless steel components
  • Fits all M4, M16, AR15, AR10 variants and other firearms that have a flat top receiver or removable carry handle
  • A permanent rail mounted alternative to a standard A2 rear sight or carry handle
  • Provides constant access to fixed sights that continuously hold their zero
  • Extremely durable and reliable providing peace of mind
  • The most rugged fixed rear sight available

Package Contents:

  • Troy Rear Di-Optic Aperture (DOA) Fixed Battle Sight

Troy Dioptic Apeture DOA Top Mounted Deployable Iron Sight Orderable Models

List of Orderable Models

  • Troy Dioptic Apeture DOA Top Mounted Deployable Rear Sight, Black, SSIG-FBS-RDBT-00 , MPN: SSIG-FBS-RDBT-00 , UPC: 812699011720 , Code: OY-IRN-DOABATTLEFIX-SSIG-FBS-RDBT-00
  • USED, Troy Dioptic Apeture DOA Top Mounted Deployable Rear Sight, Black, SSIG-FBS-RDBT-00 , MPN: SSIG-FBS-RDBT-00-EDEMO , Code: OY-IRN-DOABATTLEFIX-SSIG-FBS-RDBT-00-EDEMO-RE-B

Troy Dioptic Apeture DOA Top Mounted Deployable Iron Sight Unavailable & Discontinued Models

List of Unorderable Models

  • Troy Dioptic Apeture DOA Iron Sight, Flat Dark Earth, SSIG-FBS-RDFT-00 , MPN: SSIG-FBS-RDFT-00 , UPC: 812699011737 , Code: OY-IRN-DOABATTLEFIX-SSIG-FBS-RDFT-00
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