Non-NFA Glock rifle? Yes, please!

CAA Micro Roni left profile

Carbines are great, but many Glock fans wish for a long-barreled version of their favorite sidearm. Thanks to CAA of Israel and Impulse Gun Barrel (IGB) of Austria, Glock owners really can have it all, and most importantly, without waiting for a NFA permit.

Over the shoulder view shooting the Micro Roni
The foregrip is also the spare mag well. Tons of rail means room to accessorize the way you want.

I recently had the chance to test the CAA Micro Roni and IGB 16-inch barrel for a couple months now. It’s been a surprisingly good ride. The Micro Roni is a modular conversion kit originally designed as a short-barreled rifle (SBR), making a full-size Glock into something easier for more people to wield and ready to load up with accessories. CAA makes an arm brace version of the Micro Roni that doesn’t require a long wait and $200 for the NFA tax. But it’s not quite as handy or as sexy as the folding-stock Micro Roni.

Solution? Add a 16-inch barrel to that pistol and you’ve got yourself, in order of importance:

  • Accurate
  • Stashable
  • Cool Glock rifle

Enter IGB Austria, maker of unusual barrels for Gen 3 and 4 Glocks. The model in this case is a Gen 4 Glock 17; CAA kits and IGB barrels are model-specific.

The Specifications

IGB makes barrels of cold forged steel. The company’s machining process produces a mirror finish on the interior. Hardening is done by Plasmanitration, which is said to crank out diamond-hard surfaces without flaws common to older methods. Plasmanitration produces a dark gray, corrosion-resistant finish. Inside, tooling of the groove-to-field angle, with slightly rounded edges, is said to enhance durability and ease of cleaning.

The Micro Roni is polymer, 2.5 inches wide and 5.7 inches at its tallest point. It measures 23.75 inches long folded and 31.75 inches in ready position. The Micro Roni weighs 56 ounces sans Glock and barrel. The complete assembly, without mags and ammo, weighs in at a bit less than five pounds.

CAA Micro Roni with scope
The Micro Roni is compact, but it can still handle a magnifying scope and BUIS.

Set UP

The IGB barrel simply replaces the original after a typical field strip. The one used in this case was IGB’s 16-incher with a threaded end that left me wanting at least a flash hider if not a suppressor to balance the appearance of the assembled product. But as it is, it’s light and packable.

Inserting a Glock into a normal Micro Roni takes just seconds. With the barrel attached, some disassembly is necessary. A 2.5 and 3mm Allen wrench and 3mm punch are necessary to undo three screws that secure the block and folding stock into place. A simple brace fits over the slide, creating an ambi charging handle. This was about a 15-minute process, including repeated glances to a tutorial provided by YRS, Inc., the U.S. distributor of CAA products.

Using the Micro Roni/IGB

The Micro Roni has no lack of rail space on any plane. I opted at first for flip-up iron sights, and later added a magnifying Leupold scope for accuracy testing. There’s plenty of room for whatever you prefer.

The folding stock clicks easily into extension. A triangle-shaped piece of polymer covers the trigger guard on both sides and is easily rotated away—it’s a reliable mechanical safety.

CAA Micro Roni disassembled with tools
So many parts. Unlike the Micro Roni alone, a little pin and screw action is required to set up the unit as a carbine.

A great feature of the Micro Roni is that its foregrip doubles as a spare magazine holder. Retention of the mag is ingenious. The bottom of the well is shaped to hold the mag firmly without moving parts. With the stock shouldered, simply grab the mag in a fist and use the thumb to push up on the well, and it releases. It’s as intuitive and simple as a design can be.

As expected, felt recoil was minimal, as with any 9mm carbine. Is that round going faster out of the 16-inch barrel? Without a chronograph to help, I consulted Andrey Komorov of YRS, distributor for both CAA and IGB. The answer is yes, but not as much as I imagined. The biggest speed gain for a 9mm round from a longer barrel happens at the 10-inch mark, and the average gain is a 14 percent feet per second. Barrels longer than 10 inches have no positive influence on muzzle velocity. That gain is an average; grain weight and any +P factors, can vary the result.

That modest gain in velocity and greatly increased control over the firearm definitely pay off in the accuracy department. The Micro Roni, equipped with a magnifying scope and fired from a supported benchrest position, shoots 4 MOA groups from 25 yards with great consistency, loaded with 147-grain Federal JHP. Lighter FMJ bullets of several brands produced acceptable, but looser, groups. It’s my theory that the heavier bullet does a better job of dampening movement in the barrel as the round begins its trip from the chamber. After all, it’s easy to jiggle the barrel at the muzzle end.

CAA Micro Roni left profile
With the Micro Roni stock folded, this 16-inch barrel setup is still very easy to pack as a trail or truck gun.

My home range has a steel cutout that’s about 36 inches square; set at 185 yards. It’s good entertainment to try and hit it using a handgun, at least on calm days when hits are audible. My hit rate with the Glock 17 is 30-40 percent. With the same gun inside the Micro Roni, with BUIS and not a scope, I was hitting 6-7 times for every 10 rounds with cheap FMJ. The Micro Roni is a Glock force-multiplier.

Get Set, Go!

Gotta keep it legal, so get the IGB first. YRS has them listed for $350, with sales reducing that price at times. The Micro Roni for Glock 19, 23, and 32, or 17, 22, and 31, is $249.95; add $209.95 for an upgrade kit that includes a sling, sling mounts, a flashlight built to fit the socket under the muzzle end, flip-up rear and front iron sights, and thumb rest—handier than it sounds.


With prices of entry-level AR15s and pistol caliber carbines being about the same as this combination, it might be hard to justify the kit from a price perspective. However, there’s something very satisfying with being able to turn your Glock into a rifle whenever you choose.


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Comments (17)

  1. Would it work on a Generation 1 o2 Glock 26-or a Generation 1 or 2 Glock 30?
    A trail gun where handguns aren’t permitted e.g.Appalachian Trail

  2. Maybe someone will make a folding stock for my Ruger PCC, with Glock Magazines? Legal; breaks down for travel in seconds; and accurate.

    1. Correct, if you never have the weapon configured with a short barrel and the stock attached at the same time, you can go Pistol -> Rifle and back as many times as you want.

      Just be sure to add the long barrel, then install the stock to change to a rifle.
      To go back, make sure to remove the stock first, then install the short barrel.

    Which firearms are regulated under the NFA?
    (1) a shotgun having a barrel or barrels of less than 18 inches in length;

    (2) a weapon made from a shotgun if such weapon as modified has an overall length of less than 26 inches or a barrel or barrels of less than 18 inches in length;

    (3) a rifle having a barrel or barrels of less than 16 inches in length;

    (4) a weapon made from a rifle if such weapon as modified has an overall length of less than 26 inches or a barrel or barrels of less than 16 inches in length;

    (5) any other weapon, as defined in subsection (e);

    (6) a machinegun;

    (7) any silencer (as defined in section 921 of title 18, United States Code); and

    (8) a destructive device.

    [26 U.S.C. 5845; 27 CFR 479.11]

    1. The permit in question that will allow for legal ownership of an SBR of placing a stock on a firearm registered as a pistol.

  4. A Kel-Tech Sub 2000 is the 299.00 answer. Keep your G19 as your sidearm. The 32 round magazines interchange perfectly and the price is right.

  5. This is cool but Mech-Tech has a carbine upper that fits onto a Glock frame. These are in my estimation over built and substantial.

  6. Handy looking modification, but I agree with an earlier post, 16″ is too much barrel. I did entry work during my career in the Marine Corps and while an HK MP5 is pretty compact and can still get in the way real quick. How about a 12″ barrel chambered in 460 Rowland for the G21? I can easily see every cop in the country having one of them nearby, loaded with 185 grain JHP’s. That combination would knock the snot out of anything!

  7. It’s a neat idea. But… my grandad would say, never break something good to try and make something better.
    I like my glock as it is. The accuracy is not relatively better with a longer barrel and if I want a hotter load, I’ll make a hotter load.
    Neat though.

  8. Why a 16″ barrel if it’s not adding to velocity or accuracy? Think about a 12″ threaded option for folks who want to add a muffler

  9. I am a big fan of SBR’s, and have several in pistol calibers; including a Roni/Glock. But, I add up the authors price for the components of his project, and it is over $800. That is most certainly not “comparable to an entry level AR15”. You can snap together s very good mil-spec carbine for less than half that cost if you know where to shop. PSA comes to mind. And unless you are building an actual Glock SBR or a braced clone, get a TNW Aero carbine snd call it a day.

    1. I do not know if it went through the first time, so this is a resend.I like the idea here! That is very cool! I have an HK MP5K PDW with a vertical k-foregrip and a folding stock with a permanently attached fake suppressor to make it a legal rifle at a 16″ configuration. I would need to pay $200 tax stamp to turn it into an SBR and remove the fake suppressor to expose the three lug for other purposes. I also have an HK MP5K pistol that has a straight horizontal forearm.I would also need another $200 tax stamp to add the k-foregrip or a folding stock to make it also an SBR. Once this is done, I CANNOT go from rifle to pistol by adding or removing an item as this is considered a permanent change. Also the receivers will have to have a permanent etching or stamping to identify the change. Am I missing something? All that said, I understand getting your long 16″ barrel from IGB first, then getting the Micro Roni that has that vertical foregrip that holds an extra magazine that makes that a long barreled pistol.Once you add the folding stock, it would become a legal rifle. If you bought the Micro Roni alone and placed the Glock with normal pistol length barrel in, would make it an SBR because of the vertical foregrip. Add a folding stock to this configuration would still make this an SBR. Even if you add a brace to this configuration, because of that vertical grip will still make that an SBR. It all sounds great! But I would add to caution, please be careful! I do not want to see anyone here getting into trouble with the law. Enjoy your weapons as I do mine. Just be safe! IMHO

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