Hera Triarii Glock Enclosure Review

Out of the three enclosures, the Hera is the easiest to operate and feels the most like a carbine. If you are built like a brick shithouse or have a desire to build this into a longer-range carbine the Triarii might be your best choice.



The Triarii is $475.20 directly from the Triarii’s only US retailer Lan World. The folding side unit was an additional $115. You will also have to buy a buffer tube and a stock. In my case, I used a generic $25 buffer tube and a MagPul MOE stock.

This makes the Triarii the most expensive out of the enclosures I tested, at a pre-shipping price of approximately $665.


The Triarii is made entirely out of aluminum. The Triarii is designed to be used with an AR buffer tube and stock. It does not come with any stock attachment, which also makes the Triarii the only enclosure you could own in the US without an NFA-registered Glock.

The Triarii has four very long rails for all sorts of accessories. I dislike a lot of rails on something I intend to carry in a bag, but it’s okay for the Triarii — because it’s so long I would never bag carry it.

Weighing in at 4 pounds, 15 ounces, the Triarii was the heaviest of the enclosures I tested. It is also the longest, with a folded length of 18.5″, a compressed length of 26.5″ and a fully extended length of 33.25″. Holy shit.

The folding stock adapter adds about 1.5″ to the Triarii, but it’s very solid and is easy to manipulate. Just push the easy-to-find but not obnoxious button and push.


The Triarii lacks any concept of a trigger guard. This leaves you with two viable options:

  1. Run the Triarii like a rifle, with a fully loaded magazine inserted by no round in the chamber
  2. Use a Kydex trigger guard cover like the Dale Fricke Zac or similar.

Either way, you will have to add a step to your deployment process.


Putting my SBR Glock into the Triarii was incredibly easy, and is by FAR the easiest of the three enclosures I tested.

You rotate a disc on the front of the Triarii to “OPEN,” which unlocks the enclosure. The Glock goes in, rail first, and then you slide the enclosure shut and rotate the disc to “CLOSED.” Done. Once you know what you’re doing, it will take you longer to read this paragraph than to install a G19 into the Triarii.


The only problem with this system is that the unlock disc is VERY prone to movement if bumped or brushed. I have some concern that it could rotate to the open position during heavy use, or from extended time inside a bag.

The Triarii unlocks via this disc. I wish it had a more positive latch / detent.

The Triarii unlocks via this disc. I wish it had a more positive latch / detent.



The Triarii’s charging handle pushes the front of the Glock slide backwards in order to chamber a round. This is somewhat similar to the KPOS mechanism. The Triarii’s charging handle design gives you a mechanical advantage over the KPOS. The handle is very close to the nose of the slide, and the pistol is centered in the Triarii and therefore closer to the center of your chest. All of these things add up to make the charging handle fairly easy to manipulate. The CAA RONI took top honors for easiest to charge, but the Triarii wasn’t terrible. Only the She-Shepherd, at 5′ 2″, had noticeable problems with the Triarii.


Unfortunately, neither the Triarii nor the KPOS provide a way to fix a slide out-of-battery problem. The usual way to fix a slide out of battery is to bump the rear of the slide. This is impossible with the Triarii or the KPOS. I’ve only encountered an unintentional out of battery handgun slide once during training, but it’s possible. I think the KPOS may be especially prone to this kind of malfunction because of the way the slide is manipulated.

The Triarii was the most comfortable of the enclosures to shoot. I was surprised at the amount of perceived recoil from the KPOS and RONI; only the heavyweight Triarii soaked up enough recoil that I thought I was shooting something smaller than 9mm. As with all of the enclosures, accurate four round bursts were easy, and it was easier for me to shoot at intermediate pistol distances due to the additional points of contact and red dot.

The Triarii was the most reliable of the three enclosures we tested. There were two failures to feed, both with Aguila ammunition. We fired just over 200 rounds of Aguila, WPA, and CCI Blazer ammunition. I attribute the Triarii’s reliability to its all aluminum construction, as well as how the Glock mounts inside of the enclosure.



One thing I really dislike about the Triarii is that there are two ports in the rail — right where the muzzle of my G19 sits, and right where my hand rests naturally. Every person who evaluated the Triarii experienced excessive heat and/or powder burn, with me getting the worst of it:

triarii review 2-0

No serious damage, but it was startling and uncomfortable. An interesting design choice.


My experience with the Triarii was almost universally positive. It was the most reliable, the most well built, and the easiest to convert from pistol to carbine. It’s large size and heavy weight make it perfect for bigger folk who are looking for something to fit their longer arms.

However, the Triarii is way too big for my needs. When folded, the Triarii is longer than both my SBR AK47 and my AR15 300 Blackout pistol. While a four round burst of 9mm is more controllable, I also feel like I’d rather have a rifle than a 4″ barreled Glock 19.

Frankly, I feel like if  you’re going to get a pistol caliber carbine the size of the Triarii you might as well get a Beretta Storm or similar. After all, the Storm is just three inches longer (or almost four inches shorter at the Triarii’s full extension) but you also get a 16.6″ barrel for better velocity.

About the Author:

Short Barrel Shepherd Short Barrel Shepherd is a regular guy and works to make Web sites and mobile apps easier for people to use. He spends his free time attending fight-focused firearm, knife, and combatives training, motorcycling, writing, and playing games. His daily carry is a Glock 19 pistol and an AR15 .300 Blackout pistol in a backpack.

10 Comments on "Hera Triarii Glock Enclosure Review"

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  1. David says:

    I saw that thing, and just thought “I’d rather have a Sub-2000”.

    And I sold my Sub-2k, so you know I’m not a fanboy.

    • Short Barrel Shepherd Short Barrel Shepherd says:

      Yup, it’s a weird duck. I have some gigantor friends that make it look less ridiculous, but for something the size of a rifle I’d rather just have a rifle.

  2. B R Kurtz B R Kurtz says:

    Im still not sure where I place the pistol enclosures in the SBR world. On the one hand, I do like that they give a pistol 4 points on contact and the potential for better optics; but conversely they also make the pistol heavier and larger for the same barrel length/ballistics level as the original pistol. So its a Pros VS Cons argument–sometimes it good-sometimes not.

    A SBRd G29 in 10mm or maybe a G35 in 357SIG would enhance the potential range and power potentially making the larger package worth the effort; yet not be too overpowered for handgun ranges. Ultimately I keep hoping someone will design a simple folding or collapsible buttstock, that allows the pistol to still be holster carried and be deployable to use a SBR when needed.

    As too the ZACK as a trigger cover, I cant recommend them enough. I find Im using a ZACK more and more as a daily carry holster. Years ago when Glocks were first becoming PD weapons, there was a “Trigger Block” that slipped in behind the Glock trigger and supposedly easily “popped” out, (think of it as “Touch Index”). Im not sure if they are still available but that might be an alternative for bag carry.


  3. JonnyV says:

    any thoughts on the SIG ACP-LE ?

    (the lock up between the frame/pistol, seems similar to the KPOS)

    • Short Barrel Shepherd Short Barrel Shepherd says:

      Hi there! I considered getting one, but after the amount of money I spent on the enclosure reviews I am not anxious to plunk down for another experiment. I’m going to try to find John Hollister at SHOT Show and see if he can help me out.

  4. Steven says:

    I know this is old, but have you thought about tying a trigger guard into the bottom of the bag, this would reduce the number of steps required for deployment.

    • Short Barrel Shepherd Short Barrel Shepherd says:

      Cool idea, and one that is easily accomplished given the number of trigger guard holsters available.

      In my personal experience in using a prototype trigger guard cover on AR15s and AK47s, I found flipping the guard off was a little unwieldy and unusual. I am sure it could be overcome with practice and training.

  5. Bryan says:

    Since we are talking about this enclosure with a glock, what about the extended drop in barrel options? would increase the ballistics and close the sbr – pistol gap for $100-200 range.
    Also, how does the front of this enclosure look? if a threaded barrel was used on the glock, could a screw on comp be used? Like the Lone Wolf one?

    • Short Barrel Shepherd Short Barrel Shepherd says:

      Hi there! You could definitely put a longer barrel in there. I know that Lone Wolf makes a 9″ barrel for the G19. I don’t know if this would further effect reliability or not; it would be interesting to try.

      Here’s a picture of the front of the Triarii; this makes using a muzzle device a little challenging but it could be done.


  6. Joe says:

    Some of you are missing the point of the Triarii. Make that point’s’…

    1. You a have Glock… great! Now you want a carbine. Do you buy another weapon that you have to register? Or just get an adapter for the weapon you already have?

    2. Mags. Want to buy more?

    3. Have a legally registered Glock auto sear? Great! imagine how the weight and length of the Triarii will come in now…

    4. There’s more but, if you haven’t gotten it by now, you probably never will.

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