HMMWV Bullet Proof Glass Test

My friend sent me a message on Sunday night. “Would you be interested in some bullet proof glass?” He then sends me this picture. “They are 2 inches thick.” I immediately said yes and that we can test them the next morning. They were left behind from an evicted tenant of his parent’s property. My friend’s dad wanted to throw them away, but asked his son if he was interested in taking them.


I posted up the picture above and asked my Facebook friends if they knew anything about bullet proof glass. One friend, from Korea, thought they looked a lot like the front windshields from a Hummer.


My friend and I picked them up yesterday morning. Immediately I noticed the etching on the glass says “Impact Side”. Also they are made by Ibis Tek, a local defense contractor that specializes in transparent armor. The metal ribbon at the bottom of the pic below, is the defroster and runs along the edge of the glass and has two wires protruding out from one of the edges.

BP glass


There were three driver side front windshields. We kept one for each of us and shot up the third one. We took them out to the range and set one out at 50 yards. We were warned, from friends online, to expect ricochets. I decided to treat it like steel poppers. So we would not be shooting these at point blank range.

We used the following guns to test the glass with FMJ rounds and rifled slugs.

S&W M&P C.O.R.E 9mm

Glock Gen4 G35 and Ruger SR40C both in 40 s&w

KSG 12 Ga slugs

Troy Carbine 5.56

FNH SCAR 17S 7.62×51

Here is the aftermath.

BP glass 2


One of the impacts made a circular pattern in the glass.

BP glass 3


Here is the impact from my SCAR 17S.

BP glass 5


The backside is still smooth and undisturbed.

BP glass 4


Here is the video.

The impacts from the 40 s&w were the most surprising to me. Compared to 9mm and .556, the 40 s&w made some spectacular impacts. Of course the .308 made the most impact with just one round.

Nicholas C

Co-Founder of KRISSTALK forums, an owner’s support group and all things KRISS Vector related. Nick found his passion through competitive shooting while living in NY. He participates in USPSA and 3Gun. He loves all things that shoots and flashlights. Really really bright flashlights.

Any questions please email him at


  • MIKE

    I’ll bite. Zero penetration of all rounds? No spalling?

    • Nicholas C

      Spalling? Well some of the rounds bounced off and ricocheted. But no penetration at all..

      • J.T.

        Spalling is glass shards coming off of the back side even though the bullet was stopped.

        • Nicholas C

          In that case, nope. The back surface is smooth and undisturbed.

  • JaxD

    Glad our boys have these on their Humvees.

  • 101nomad

    Windshield wipers not going to clear that.

    • gunslinger

      but it will buff right out

  • Ken

    It needs some M2AP .30/06.

    • Rusty Shackleford

      What it really needs is MK211 RAUFOSS but we’ll have to settle for M2 AP.

    • Nicholas C

      I know. But I don’t own anything in 30/06. I should have called an acquaintance with .338 Lapua Magnum.

      • Ken

        Drive it here to the People’s Republik of Maryland or the great Commonwealth of Virginia and I’ll gladly let you put a clip or two of M2AP into it with one of my M1’s or my 03.

        I’d also be interested to see what the mild steel core of surplus 7.62x54R would do to it. I’ve recovered plenty of those mild steel cores from the berm before. When the slugs hit rocks or gravel, the jacket gets shed off and the core keeps going. The nose of the mild steel core is usually deformed but otherwise intact. The hardened steel cores of M2AP (I believe around 700 Brinnell) are found perfectly intact after striking the same gravel and rocks.

        • Nicholas C

          Thanks for the offer.

      • BryanS

        If you want, we can give it a go with my M1, and I might be able to borrow something a bit more… interesting. Good friend has .338 and .50 bmg rifles.

  • Duray

    When you refer to “.556” once, it’s a typo. When you do it twice, that’s just ignorant. Because math.

    • iksnilol

      Not much difference 556 is so tiny whether you call it 5.56 or .556.

      This has been a pretty decent Joke IMO.

    • Nicholas C

      Thanks for catching that.

  • Reco

    Seal it and put the rough side down and it’d make a cool coffee table.

    • Nicholas C

      Yep that is my plan. Just not sure what to use as a sealant.

      • Joe

        Sorry, but im a bit confused. The date on the galss says
        05/46. As in 1946??? Whats up with that?

        • Nicholas C

          Haha I thought that too. My Army buddy says that is supposed to mean 2005, 46th day of the year.

          • Renegade

            Yes; Same as the date stamps on tires.

          • Aren’t they year and week?

        • DGR

          We use the Julian Calender in the military supply system. Harkens back to the first punch card computers when it was faster to just use the Julian calender than add a separate column for the month. We just never got around to changing it since it never really broke, and if it isn’t broke….. So as mentioned above, 05/46 refers to the date it was made, the 46 day of 2005 (15 Feb 2005).

      • SteveK

        No need to seal it- it’s already non-porous. If you are concerned about bits of glass falling, just rig a cloth “shelf” under it. If you really want to seal it, a low viscosity epoxy is the way to go, like the floor epoxy you see in stores sometimes.

      • JaxD

        Table top resin epoxy. Seals great, you can leave it impact side up.

      • Chris Zak

        cover it in polyurethane

      • BryanS

        use the epoxy they have for finishing countertops. Its made for this sort of thing, and ends up filling out flat.

  • guest

    Saw an old video showing iraqi rebels shooting at HMMWVs driving past an alley with a truck mounted KPVT, around 30m range or so. Long story short the KPVTs did short work of the armor. But probably everything .50 and less won’t do much, even at point blanc range. Glass in general is a very strong material, with hardness greater than most bullets, just need proper lining to work right.

    If memory serves me right there is a company that makes glass laminate with just ONE sheet of transparent plastic film behind ONE sheet of glass, around 3/8″ thick, and that is enough to stop 9mm/.40 FMJ. Remove the film and it won’t stop a small rock.

    • guest

      Also, in soviet russia bulletproof glass tests you!

  • Jas

    Pity you did not try .22lr. An AM 180 (at 1400 rpm) makes a bigger impression (read: hole) than any of these single hits.
    Ages ago we tested 7.62NATO AP resistant glass with an AM 180 (from 30 feet). Round 15 made it through and the remaining 162 just made the hole bigger.

  • Secundius

    I have a question? Why isn’t ALON or Sapphire Glass used, instead of Ballistic Glass.

    • Justin

      Is this a serious question? Because it’s cheaper. It’s designed to stop projectiles, not be a scratch resistant phone screen…

  • Secundius

    Not so great, I live in Virginia!

  • Secundius

    No, joe! The correct answer is 15 February 2014.

  • Justin

    Thanks for this incredibly scientific test to confirm what lengthy & expensive military testing has already determined: bullet resistant glass is resistant to bullets.

    • Nicholas C

      Well at the time, we didnt know for sure they were bullet proof glass. Only the few clues we had and confirmation from friends in the industry helped us confirm our hypothesis. And how many people do you know gets to shoot at bullet proof glass? I enjoyed this rare opportunity and got to test it on my own terms.