Defiance Backup Sights From KRISS USA

Any carbine setup with an optic for “business” use or defensive situations, should be outfitted with a pair of backup iron sights (BUIS). No matter how hardened your glass is or how long your battery life is purported to be, anything can happen and usually at the worst moments. KRISS USA has released the Defiance line of flip up sights to be used on rifles and carbines with standard top rails.

An initial pass reveals the Defiance sight set looks on par with Magpul’s MBUIS line of flip up backup sights. We will have to wait for some real-world reviews to see if they perform well enough to consider purchasing them over a set from the polymer king.

Pricing, information and specifications can be found below.

* All photos care of

Defiance Backup Sights – KRISS USA:


Rear Sight:

  • Polymer and steel construction
  • Mounts to MIL-STD 1913 Picatinny Rail
  • Windage adjustment knob – no tools needed
  • Tactile and audible detents both up and down
  • Two aperture settings
  • Folds flat regardless which aperture selected
  • Extremely low profile
  • Length Folded 2.25in / 57.15mm
  • Width at Base 1.19in / 30.22mm
  • Width at Body 1.19in / 30.22mmHeight Folded 0.56in / 14.22mm
  • Weight 2.1oz / 59.53g
  • Large Aperture Diameter 0.18” / 4.5mm
  • Small Aperture Diameter 0.06” / 1.5mm
  • $49.99

Front Sight:

  • Polymer and steel construction
  • Mounts to MIL-STD 1913 Picatinny Rail
  • Elevation adjustment knob – no tools needed
  • Tactile and audible detents both up and down
  • Wide range of adjustment for both AR-15 and KRISS Vector
  • Extremely low profile
  • Length Folded- 2.0in / 50.8mm
  • Width at Base- 1.19in / 30.22mm
  • Width at Body- .96in / 24.38mm
  • Height Folded- 0.5in / 12.7mm
  • Weight- 0.5oz / 14.17 g
  • MSRP: $32.99


LE – Science – OSINT.
On a mission to make all of my guns as quiet as possible.
Twitter: @gunboxready
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  • RShanger

    I hope the front sight has enough adjustments for a Vector. On my pistol I had to bottom out my front sight to get it to POI at 25 meters with the factory sights. I just picked up a RMR, so hopefully I won’t bottom it out too.

  • Ark

    “Any carbine setup with an optic for “business” use or defensive
    situations, should be outfitted with a pair of backup iron sights

    Eh. Nobody who reads TFB will ever trash an optic, pull an Allen wrench out of a pocket, take the optic off the rail, and flip up their BUIS to keep shooting.

    • SP mclaughlin

      You can angle ’em.

    • MeaCulpa

      I do also suspect that it will be either really hard or really easy to justify the use of a firearm in self defence after going “oh crap, the intruder is coming at me, I must defend myself and my family” *takes aim at intruder from a distance requiring optics* “oh crap my S&B 72 mm scope is out of function, I must dismount my primary sight” *pulls out Allen wrench and undoes four screws, flipps up BUIS, fires on intruder*.

      • CA

        Yeah but, you are supposed to run quick detach mounts with the scope.

        • MeaCulpa

          Yeah, I was mostly jesting. BUT if you have a gun for self defence I can’t really see the case for BUIS as the range will be short too justify using deadly force (depending on jurisdiction). At about 50 meters (12 light blue hogsheads and a fortnight in imperial measurements) I’m confident that I, as well as most semi decent shots, can hit the chest of a man without any sights at all.

    • Bearacuda

      Couldn’t you just cowitness? Since I have astigmatism I say skip both and get an etched prism sight, lol

    • DangerousClown

      Actually, I carry an allen wrench in my pocket every day.

    • Yeah, because aiming through the dead red dot isn’t a thing, nor are QD mounts…

      • Ark

        When are you ever going to have a dead red dot and not be able to replace it in a timely fashion? There really isn’t an epidemic of failing optics unless you count the Amazon trash.

        • Flounder

          A war! Or a natural disaster zone… Or every other day if you have an Eotech…

    • iksnilol

      I’m just thinkin’, if you trash your optic, won’t whatever happened also trash the rest of the rifle or the irons as well?

      • Vhyrus

        If the glass takes a shot, the rifle still works. Same as if you bash it into a door frame.

        • iksnilol

          If the glass takes a shot, you most likely did as well.

          Also, you’re more likely to bend a front sight than trashing your optic.

          • GaryOlson

            Now who’s piling up statistical improbabilities to support an unlikely scenario?

      • GaryOlson

        Irons don’t fog up after immersion in water. Your glass shouldn’t either; but that’s a different issue.

        • iksnilol

          What cheap 19th century optics are you using that fog up ?

    • Flounder

      That is cause our optics are on QD mounts sucka! Who needs an allen? He was kinda a weird guy anyways. Always stripping when you put the pressure on him.

  • Christian Hedegaard-Schou

    Now if we can just convince people that BACKUP sights are actually backups. The number of people I see that slap a rear MBUS on their rifles as a primary and call it a day makes me sad.

    • int19h

      You mean, all those people who are well aware that they’re not going to be using that rifle anywhere other than a range, and who just want a cheap, reliable sight that works well? Shock, horror.

  • Trotro

    Well the msrp is lower than mbus, so if these can actually perform I’ll give them a chance.

  • CommonSense23

    So before we started using optics was everyone stating we needed back up irons in case our primary ones get damaged? Cause they do get damaged. I’ve replaced a lot of bent front sight post in the armory. Or what about fighting at night. Never hear anybody talking about the need to bring extra lasers for us who worked mainly at night on NODs. Even though that PEQs failed probably more than any other piece of gear I’ve used.

    • Ark

      IMO, bent or otherwise buggered up irons are a LOT more common than genuine optics failures.

  • I zero my BUIS, then use the BUIS to “boresight” my dot, before shooting to confirm the dot zero.

    If it’s a magnified optic (which I wouldn’t be using for home defense), well, that’s why they make QD mounts…

    • Vhyrus

      I do it the opposite way. I zero my optic then dial my BUIS to match the dot.

      • Jack


  • Bradley

    Yes because military grade optics break all the time, but these plastic things are indestructible. I can turn my aimpoint off and hit a man sized target good enough at a sane range by using the glass as a reference point. It’s really not much different than pointing a shotgun. Think I’ll pass on multiple sights.

    • Edeco

      Two is one and one is none though, tactically speaking.

  • Vitsaus

    Is it just me, or do these look remarkably similar to the CAA sights froma few years back?

  • kjack

    I’d like to see a drop test done on these so I can know if they can actually be trusted to hold up better than a quality optic or not, as I’m pretty certain that it won’t. I’d like to direct everyone’s attention to how the top of the rear peep extends above the protective wings, meaning if dropped straight down the rear peep and windage adjustment mechanism will end up taking most of the force. There was a test a few years back that showed BUIS designed like that ceasing to function when dropped in the way I described. How this design actually made it to production with that glaring issue bothers me.

  • Test Bacon

    Eh. The added cost of sights (iron or optic) are one of the things that make unenthusiastic about getting into ARs. I know that entry models are at record low costs and now may be the best time to get one, but having to buy sights and spare mags seems like a slippery slope of turning a rifle into a LEGO set.

    For about $370 I can assembly a working AR (+sights and mags). For about $230 I can buy a .223 bolt action (+sights and mag). Now is the time to start down the .223/5.56 road but I just ain’t feeling it.

  • jerry young

    First I’d rather the backup sights be at a 45 degree angle so you don’t have to remove your optics to keep shooting unless your optics mount has a high mount like scopes where you can still use the iron sights, I don’t like the polymer part, there’s not much weight you’d save I’d rather my iron sights be made of all aluminum and steel, you can buy 45 degree flip sights that are all metal already for about the same price and non flip a little less from places like Sportsman’s Guide.

  • CA

    I’m running nothing but backup sights on my A4; one sight to back up the other.