Demo: MGI Hydra Modular Caliber-Changing Rifle

Think that the AR-15 rifle isn’t customizable enough? Well good news! The guys at MGI have come up with a rifle that allows you to swap barrels, calibers, and even magazine wells with only the aid of a small tool such as a golf tee. It’s not technically new — they were at SHOT last year — but it’s still cool and we haven’t tested one yet. But we’re working on that.


  1. avatar Aalbert says:

    The ACR did this years ago

    1. avatar Excedrine says:

      You mean the non-existent conversion kits that were never released to the public? Not to mention that the semi-auto ACR had a propensity to go full-auto. 😉

      1. avatar William Burke says:

        Jesus. And if it did, is there any way an ATF agent wouldn’t be standing nearby?

        1. avatar Samuel Suggs says:

          It wasn’t controllable you pedantic jackass; if a semi auto gun suddenly isn’t semi anymore, it’s not all giggles and wasted ammo, it’s a seriouse problem, that limits the weapons self defense and competitive utility severely.

  2. avatar Jus Bill says:

    “…with only the aide of” The e on aid is not required. Unless one needs an assistant to perform the action. judging by the video that seems unlikely.

    On topic – cool!

    1. avatar Bill says:

      I’m working on a research paper where my thesis statement is that gun owners have a higher percentage of Asperger’s than the general population as a whole, therefore, I must ask, have you been diagnosed with Asperger’s?

      1. avatar Jus Bill says:

        No. Why, have you?

      2. avatar Avid Reader says:

        I thought Asperger’s disappeared when DSM 5 came out last year?

        1. avatar Jeff the Griz says:

          It did. Now It’s all Autism spectrum. Also no more NOS (not otherwise specified). Practitioners now have to diagnose a specific illness to get full reimbursement.

      3. avatar Samuel Leoon Suggs says:

        I’ve been diagnosed, but I believe it’s serious BS (nurse flyover mom, who needed some explanation other than lack of effective discipline and general parental presence for my “poor” “anti-social” “unpopular” behavior). Also, it forced me to commit a federal crime too get into the Marine Corps (fraudulent enlistment, can’t get most mos’s with a waiver even if I managed too swing the waiver) so thanks mom hope you feel like an adequate parent

    2. avatar Matt in FL says:

      Everybody’s a critic. Or an editor, in this case.

    3. avatar William Burke says:

      Right. An “aide” is a person. And a job.

  3. avatar Taylor Tx says:

    Didnt I read here that arsenal made an AK that accepts magazines inserted straight in like an AR instead of titled in traditionally? That seems like one hell of an idea to put into new guns.

  4. avatar Skyler says:

    I just don’t get it. What’s the point? If you need another caliber, buy another weapon.

    I can’t imagine the liability when someone mixes up the parts.

    1. avatar Taylor Tx says:

      I imagine if you REALLY like the AR platform, this is for you. Otherwise, yea im with you, I need an AK sitting NEXT to my AR 🙂

    2. avatar HSR47 says:

      From what I recall, the big draw was for people who have registered drop-in auto sears, and/or registered lightning links. Often, these devices need to be tweaked to run right based on the dimensions of the lower, and the fit of the upper. This rifle design allows them to only have to do that with *one* receiver set, yet be able to easily configure that receiver set to use a variety of calibers and magazines. The fact that the only one of these rifles that I have ever seen had a sticker price of ~$2,000 would seem to confirm this.

  5. avatar Tom in Oregon says:

    That is pretty neat.

    Whole lotta banging going on out there.

    1. avatar LongBeach says:

      That’s just the porn convention.

  6. avatar Rokurota says:

    Nice! MSRP?

  7. avatar nnjj says:

    I had one of those uppers. It broke. But before it did, it was picky with barrels. It turns out that not all barrel collars are the same thickness, so some barrels wobble. But since my upper broke, barrel wobble isn’t an issue anymore.

  8. avatar PhoenixNFA says:

    msrp….and would make a heck of a SBR candidate.

  9. avatar Frank Masotti says:

    Well I have a 7.62X39 upper for my ar. All I do is switch out the 5.56 for the 7.62×39 uppers. I already have 7.62×39 mags that fit into an ar-15. I think its a bit faster and a bit cheaper then this. But, that is 1 mans opinion. 🙂

  10. avatar TangledThorns says:

    They ruined a remarkable concept by keeping it DGI.

    1. avatar Mario in NH says:

      If you have a barrel with this on it:

      and the matching bolt carrier group with a bolt for 7.62, you could probably do this with a piston system.

  11. avatar Mark A. says:

    The x39 magwell doesn’t accept Tapco mags at all. Finicky with surplus mags.

  12. avatar Vuddha says:

    The 7.62×39 barrel should have a piston option. I’m personally not a huge fan of piston AR’s, but cheap corrosive Russian surplus would make the piston more worthwhile. The 7.62×39 looks so wrong, yet oh so right.


  13. avatar Sixpack70 says:

    Pretty cool Idea. I like how they changed the magwell rather than have to find AR 7.62×39 mags. If how many guns you owned due to space were an issue, this would be neat. Or if your wife said you can only have one gun and you really didn’t want to make her mad.

  14. avatar Excedrine says:

    It’s like a Lego gun! ;O

  15. avatar Matt in FL says:

    I don’t know that I have any use for it, but it was neat watching it go from one to the other like that.

  16. avatar tfunk says:

    No buffer and spring change?

  17. avatar Jason says:

    Thankyou! Someone else takes notice of the coolest ar on the market
    no change of buffer spring the action operates within normal parameters as the standard ar. 7.62×39 actually operates at a much lower pressure than 5.56. It makes up for that with increased dwell time. Even if it would change operation, the hydra has a regulated gas system and special buffer to deal with increased recoil.

  18. avatar DBM says:

    Just another Barbie Doll or Ken Doll for men.

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