Home AR-15 Smyth Busters: Does Your AR-15 Really Need Backup Sights?

Smyth Busters: Does Your AR-15 Really Need Backup Sights?

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You’ve probably heard it or read it on social media: folks saying you NEED backup sights on your AR-15. Really? Steve and Caleb get on target with the truth about backup sights. Both guys put backup sights on their ARs, but it depends on the situation. A range fun / plinking gun doesn’t need backup sights, but they’re handy if your main optic’s battery gives out and you forgot to bring a spare. Under some conditions, you can actually shoot better with a traditional “iron” sight. Install a set of inexpensive low-profile backup sights, like the Magpul MBUS, on your rifle and you have cheap insurance against your range day getting cut short.

Backup sights are critical on any AR-15 you might need to protect your life or somebody else’s. In a life-or-death situation, you want that extra level of, well, backup in case your main optic gets broken or fails. And in competition, if your optic conks out, backup sights will keep you in the game.

Should your backup sights co-witness with the main optic? Co-witnessing only works with non-magnifying red dot sights, not with an optic that has magnification. Co-witnessing the backup sight in the lower 1/3 of the red dot’s field of view keeps the two sight pictures from interfering with each other. But there are plenty of absolute co-witness backup sights available. Some folks like the dot and the backup front post on top of each other. The backup sights don’t have to co-witness at all. It’s really a matter of personal preference.

So the myth is NOT busted. Affordable, low-profile backup sights are readily available, so you really can’t afford not to have them on a serious self-defense / competition gun.

NOTE: Products in this video are to be used only for lawful purposes, including hunting, self-defense, and competitive or recreational shooting. If you purchase any of them, you are responsible for understanding and complying with all federal, state, and local laws that apply to the purchase, possession, and use of these products.

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32 COMMENTS

  1. The British Army doesn't issue non-optical back up sights to infantry. The rifles have an Elcan optic and a piggy back red dot. If you torture your rifle enough for something like an Elcan or an ACOG to break the rifle probably won't work anyway. It's not like you ever had backup sights for your iron sights back before optics. At close range an AR with a fixed front sight will work fine without a rear sight and it will be a lot quicker.

  2. For everything needed and electronic, I think there should be a back-up, then there is glass which can get spotted (in rain) or fogged. As a former Infantry Marine, I only had iron sights '81-'85 and we shot in all conditions for the experience of knowing how to deal with them.
    As for fun guns, I still like etched reticles so if the batt fails, or a malfunction occurs, it still works.
    My go-to, has EOTech/G33 combo with flip-up Meprolight (Tritium at front post and four dots around rear peep sight) which work very good. I just flip the G33 out of the way, pop-up the back-ups and go to town, night or day.

  3. If you end up in a struggle and have issues with sights at that point, then you have bigger issues. With that being said, it's better to have them and not need them than need them and not have them. Yeah, it's overplayed, but it's true.

  4. I was hunting on Saturday. I misstepped and fell down a hill head first. Nearly broke my arm. Busted my scope. Took my scope off and took a doe an hour later (yes I hunt for meat). If I didn't have backup sights I would have lost that ability to provide for my family.

  5. Just because your optic goes down or the battery dies doesn't mean "you're done" per se. You just lose a refined sighting solution. You can still fight or compete, but now you're using the window of the optic as a large ghost ring. Good shooters will be able to limp along. I have a friend who has killed so many pistol optics in USPSA but he still manages to finish matches OK.

  6. I was thinking about this the other day, my scope does not have quick detach mounts so i would need to go home and get a tool to take it off to use my Back up sights. Where I could just reach in my gun safe and pull out a gun with functioning sights.

  7. I have the Brownells Retro scope on the "carry handle" on a Stag 15 M4 carbine with the iron sites still on it. I then have a red dot reflex on a 45 degree offset for CQB. I set this up for anything but long range.

  8. I have shot in 3 gun competitions for many years in a wide variety of conditions. I do not recommend backup sights if you use a LPVO. I works regardless of illumination as you always have the black cross hairs and it works at both short and long distances. Save your money on both the red dot and iron sights and go with a good quality LPVO like a Trijicon.

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