Desert Tech’s Small Package Puts In Work: MDRX 6.5 Creedmoor Reviewed

In my opinion, bullpups are the future. For those that don’t know what a bullpup is, this is a term for a firearm with an action and firing mechanism that is located behind the trigger. They do everything better than the conventional rifle platform by being shorter, more maneuverable, concealable, and consequently, versatile. Desert Tech is a top dog in this niche market that is constantly releasing innovative and quality products: and I have their newest release, the MDRX (Micro Dynamic Rifle Extreme) in 6.5 Creedmoor. Many of you have likely heard of their all-too-familiar MDR already. Well, this new MDRX is basically the same rifle, but improved. How so? Let’s dive into the details!

The MDRX made for a pleasant change from the normal range day visit. By the end of the day, I had addressed a lot of people’s questions about the firearm and taken home a whole new appreciation for the system. Note: The handguard on my MDRX is a 10″ option that does not come standard.


The MDR and MDRX are so similar that you can interchange any part between the two. This includes barrels, handguards, and the likes. That said, they are not identical: The MDRX has an improved trigger over its predecessor. This improved trigger has a lighter trigger pull and less creep. This revised model also features a stronger polymer resin that is more resistant to high-impact falls. And because the MDRX is designed to be a workhorse battle rifle, they also improved gas block drainage for better performance in mud and water submersion testing.

The MDRX comes with a Ratchet muzzle brake that is caliber specific.

The MDRX retains the MDR’s ability to be converted between 223 Remington, 300 BLK, 308 Win. and now, 6.5 Creedmoor. Yes, you are correct in noticing that this is a mixture of small and large frame calibers. This ability alone makes the MDRX very unique and adaptable. And that is without noting that there are aftermarket barrel options.

This new offering also provides another unique option with the MDRX SE which is a side ejecting model. This is for those of you who prefer the simpler, or more conventional ejection system over the MDRX’s forward eject. As with the MDRX, the MDRX SE can be configured to eject on either the left or right side by simply rotating the bolt 180 degrees and swapping the ejection port cover, allowing the gun to be comfortably operated by either right-handers and/or our beloved wrong-handed.

Close up of the forward ejecting port.

Examining the MDRX

Starting from the beginning, the MDRX is a bullpup, semi-auto rifle that can be configured to fire 223, 300 BLK, 308 Win., and 6.5 Creedmoor at the moment. It takes your standard AR magazines and is totally ambidextrous. Because it’s a bullpup, the MDRX can have a longer barrel than your standard rifle while still maintaining the same length, or even being shorter than said rifle. This gives you the advantage of additional velocity, which is great for hunters, long-range shooters, or military (sometimes a few inches on the barrel is the difference between defeating body armor or not).

Here, I compare the 20″ barreled MDRX with a DDM4 PDW with a 7″ barrel and suppressor.

Some would question the ergonomics of the MDRX because they have never handled a similar firearm, but I assure you that everything feels natural and all controls are operated familiarly. To release the magazine, you can hit a mag release with your pointer finger, located on either side of the gun above the trigger guard. You can also release the magazine with a button located in front of the magwell; this can be decided by the user based on what feels/works best for them when training with it. A similar trend of options can be seen with the bolt catch. You can drop the bolt using a lever at the rear of the magwell, or slap the charging handle down and continue blasting away. Again, choose whichever method you prefer.

Adjusting the gas block on the MDRX’s short-stroke piston system is great for tuning your particular rifle to specific ammunition, or decreasing gas for use with a suppressor. Thankfully, doing this is also simple. All it takes is a screwdriver, bullet tip, allen wrench, or some other tool to rotate the gas selector to the desired position. Now, you can even access this gas selector without removing the handguard, unlike with the MDR. Total, there are 6 different gas options that you can use to fine-tune your unique setup.

The Adjustable gas block can be accessed through the window in the handguard. No need to take the handguard off to tune your rifle.

As always, the trigger on this bullpup is going to be a source of a lot of questions and a bit of concern. After firing several hundred rounds through the MDRX, I became familiar with how it felt. I would compare it to your typical mil-spec trigger in any AR15 except it’s lighter than a mil-spec AR.. There is a bit of creep with a slightly mushy break at 4.5 pounds (measured with my Wheeler Trigger Pull Gauge). The trigger reset is very crisp though.

If you don’t know, there is a lot of challenges for engineers to design a streamlined trigger linkage that provides a crisp and light trigger pull safely. Typically, bullpup triggers are on the heavy side so they do not fire when dropped or jostled just right, and being designed as a battle rifle, the MDRX follows this trend. Even though it sounds like I just bashed the trigger on the MDRX, I would place it above most semi-auto bullpup triggers that I have used.

The MDRX has a flat-faced trigger that allows you to position your trigger finger where you like. It is also very long, allowing you to use mechanical advantage to get a more comfortable trigger pull.

Disassembly and Barrel Swapping

Because the MDRX has been designed to easily convert between calibers and swap barrel lengths, the barrel is extremely easy to remove. Simply loosen the two screws on the side of the gun in front of the ejection port, rotate the barrel lock next to these screws and slide the barrel out of the action. You can also remove the handguard in a similar fashion. loosen the Torx head screws on either side of the handguard and then punch the pin on the underside of the handguard through. Then just pull the handguard off. You can also remove ejection port covers and bolt in a similarly simplistic manner.

In this photo, I wanted to show how the barrel sits back behind the trigger. Also note the adjustable gas block and short-stroke piston.

Accuracy Testing

I rigged up the MDRX with a 4.5-27×50 Meopta Optika6 and set out my target at 103 yards, measured with a Leupold RX-2800 TBR/W. I then fired several 5 shot groups with a handful of different ammunition types. Below, you can see the average groups from Hornady Match 147 grain ELD-M, Hornady Match 140 grain ELD-M, Hornady American Gunner 140 grain BTHP, Hornady 143 grain Precision Hunter ELD-X, and 130 grainPrime BTHP. Even across the 130-147 grain weight range, my results were pretty consistent in hovering around 1 MOA, which is what Desert Tech claims for the MDRX on their website.

Desert Tech’s Warranty

Desert Tech’s warranty will allow you to return your firearm and get it fixed or replaced at no expense. This will cover any kind of defect in barrels, conversion kits, and firearms from manufacturing or materials for the lifetime of the firearm, regardless of ownership. However, there are some exclusions to what they will cover: they will not cover firearms that have been modified, had aftermarket parts installed, has not been properly maintained or been damaged by high-pressure ammunition or reloads. This warranty applies to any customer in the U.S.A or Canada.

The MDRX’s charging handles tuck up against the rifle when they are not being operated. They are also non-reciprocating and allow for total ambidextrous operation.

Specifications and Features

  • caliber options: 223 Remington, 300 Blackout, 308 Winchester, 6.5 Creedmoor

The following specs are for the 6.5 Creedmoor conversion

  • 20″ barrel
  • 1:8 twist
  • 30″ total length
  • 5/8×24 TPI muzzle threads
  • 20 round mag included
  • accepts SR25 magazines
  • 4.7 – 4.5 pound 2-stage trigger
  • 9.2 pounds (12 pounds as seen in pictures)
  • swappable forward eject
  • short-stroke piston operated
  • 6 gas block settings (includes suppressor setting)
  • ambidextrous controls
  • last round bolt hold
  • starts at $2,099.98 MSRP

Final Thoughts

I really enjoyed my time with Desert Tech MDRX. The rifle is a prime example of human ingenuity and true innovation. Not only is it unique, but it fills the role that it was designed for perfectly. The MDRX is the ultimate battle rifle because it is short and mobile without giving up barrel length and the accompanying velocity. A longer barrel will also emit less muzzle flash than a shorter comparator which is important for staying concealed.

If you are looking for a hunting rifle, I realize that all points I just made are moot. That said, in light of current events it is becoming increasingly apparent why the second amendment exists. I (and others) would concur that a battle rifle is important to have and to train with, in hopes that you never have to use it to defend yourself and your beliefs. And if it means much to you, I would depend on the MDRX for this purpose and it would be high on my list of preferences.

After putting a ton of hours behind the MDRX, It’s gained my respect and secured my interest. This is definitely a firearm that I would like to own.

Learn more about the MDRX and Desert Tech by clicking HERE!

Buy a Desert Tech MDR on GunsAmerica!

About the author: Riley Baxter is an avid and experienced hunter, shooter, outdoorsman, and he’s worked in the backcountry guiding for an outfitter. He also get’s a lot of enjoyment out of building or customizing his firearms and equipment. Check out Riley’s Instagram @Shooter300

{ 29 comments… add one }
  • Dave T July 15, 2020, 10:05 am

    I’m considering a SE model. Does anyone know if the ejected brass will clear the shooters face after a shoulder transition.

    • Michael March 26, 2021, 8:55 am

      If it does not you can easily swap it to forward eject

  • rkga July 6, 2020, 1:06 pm

    Before you decide to buy an MDR, everyone needs to know that Desert Tech is a small and poorly managed operation. I waited more than 2 years (while Desert Tech had the full amount deposit) for my MDR. I originally ordered the 223 version, but DT wasn’t delivering them so I took a 308, and had to pay more. The first MDR’s had loads of problems with the gas valve (2 iterations) then a complete rework of the innards. MDR did do a rebuild of my MDR via warranty. You can do a Google search to see the early negative reviews and why the rebuild was necessary. After waiting years, MDR announced it was making conversion kits for the 223 caliber. However, since January, 2020, DT has had my money and still not delivered the conversion kit. Its been 7 months. Consider this when you decide to make your buy.

  • Norm Fishler April 27, 2020, 4:24 pm

    I’m sure it is a fine rife, as far as bullpups go, but 12 pounds as pictured/$2100, I’m just gonna have to pass. I see absolutely no compelling need for it that any number of other items I have will do just as well or better.

  • P-Square April 27, 2020, 2:21 pm

    Great concept, but lacking GD&T + QA / QC: New out of the box and without firing a single shot, mine has
    1. A miss-aligned 556 gas block (7.62 barrel also displays the same symptom, but was judged “within tolerance”),
    2. Binding magazine release after swapping out the Mag Catch, and
    3. Handguard not alignment with receiver.
    Yes, they are all covered under DT’s lifetime warranty, but the owner must ship it back at his / her own expense ($65.00) for any warranty service. Like my buddies joked, DT must have had so many issues that paying for warranty return shipping would bankrupt the business. My friends are waiting for 3rd or 4th generation instead being beta tester for DT…

    Consensus (OK, small sample size of 5) is for 556 caliber, the AUG (and STG556) still offer the best package in weight, balance, ergonomics, and value.

  • RSConsulting April 27, 2020, 10:02 am

    ” Desert Tech is a top dog in this niche market that is constantly releasing innovative and quality products: ”

    Cough cough…

    Ever hear of a little company called, eerrrr what was their name again?

    Oh – that’s right – ISRAELI WEAPONS INDUSTRIES…

    I’ll take one that’s proven and issued to militaries all over the world – than a “small niche market” (which bullpup rifles are ANYTHING BUT).

    While Desert Tech makes cool stuff – and their announcement -> market window is slightly smaller than IWI’s (which took +2 years to release the T-7 and TS-12) – reports in the IWI groups from owners of DT’s stuff, are going to keep me away. And a “lifetime warranty” really isn’t important – if the rifle sits over at DT forever.

    Had an issue with my new TS-12 – had a shipping tag in my email 5 DURING the phone call – and it was turned around in TWO DAYS (with FREE NEXT DAY SHIPPING both ways). Doesn’t hurt that I’m friends with their US Sales Rep either – but I didn’t even drop his name on the phone call.

    Obviously I am an IWI FANBOI (have an original Tavor, TS-12, T-7 and Galil X39) – but let’s not make DT the sole (or BEST) player in this “niche market”.

    Bet Gieselle won’t be jumping on a trigger pack for this anytime soon. Yes – I’m spoiled – If I don’t do the trigger work myself, everything in my rack has either a Gieselle – or a Fulton Binary (for AR pattern triggers – with STEEL PINS so they don’t break).

    Decent review though, but let’s not make this into anything more than it is. A “boutique bullpup”. And personally, due to “anecdotal reports” from a number of end users – I’ll TRUST MY LIFE TO MY IWI…



  • John ROBERTS April 27, 2020, 9:46 am

    12 lbs.? No thanks…

    • David April 27, 2020, 1:57 pm

      I did notice the spec weight was 9.2 but as tested was 12 lbs….. would really like to know what the difference was…

  • Big Al 45 April 27, 2020, 9:13 am

    IMO, it’s been the trigger pull that has kept me away from ALL bullpup’s, I have seen and tried many, to date NONE have been desirable due to this factor.
    Most are atrocious, few are even close to tolerable.

    • David April 27, 2020, 1:54 pm

      I have a Bushmaster M17S that after a little tinkering has a VERY nice trigger. Just over 2 lbs. (Which with the large rounded trigger pad feels like 6 oz.) and just enough creep to notice if you are really looking for it, otherwise it is imperceptable.

    • briguy April 27, 2020, 4:24 pm

      I own a IWI Tavor SAR 18 and initially the trigger was heavy and mushy, however, after a couple aftermarket upgrades (Geissele trigger pack and Lightning Bow Trigger) the trigger pull now is crisp at around 5 lbs as opposed to the 8-9 lbs it was initially.

      Sure I had to spend more to get the trigger how I wanted it but most bullpups are meant for the military and thus are at a minimum minute-of-man accurate at range. The MDRX seems to be shooting at just over 1 MOA…

      So, IMHO, if minute-of-man accuracy is good for the military than I don’t mind it being the bare minimum for me and since most firearms can be modified to shoot better, I don’t mind my minimum being there

  • Charles Curtin April 27, 2020, 8:56 am

    Well, there are two different opinions…

  • Nick April 27, 2020, 8:52 am

    I’d like to see it run through dirt water sand storms before it’s okay too much internally covered uncleanable

  • Tom Benton April 27, 2020, 8:32 am

    I have owned a Kel Tec RDB 223 for three years. I quickly became my favorite platform. It is short enough to defend a house easily but with a 16 1/4 barrel retains full velocity. The Kel Tec RDB and RFB as well as the Tavor from IWI have been on the market for some time . I still believe Kel Tec has been the innovator. The trigger on the RDB is excellent and the downward ejection facilitates shooting from either shoulder. Some complain that controls are difficult on Bullpups but it is just a matter of using the platform a few days.

  • Ron Franklin April 27, 2020, 7:24 am

    Got to have this one!

  • Jeffrey L. Frischkorn April 27, 2020, 7:07 am

    It’s garbage like this one that gets all gun owners in trouble… All it will take will be one idiot…

    • Gabe Allen April 27, 2020, 8:49 am

      Let me get this straight… You’re a gun owner, and you’re complaining about people buying cool and innovative guns instead of old hunting rifles? You’re too scared of the anti-gun lobby trying to spank us over the actions of one miscreant to approve of the use and sale of “asssaaauuullltttt riiiiffflllleeesss!!!!!” (as if it matters)? This is the exact attitude that turns new people away from the firearms community. And this is coming from a 21 year old who has gotten tens of people introduced to firearms, including scary black guns. I enjoy hunting as much as the next guy, but remember hunting isn’t why the second amendment exists. My generation is very mindful of this.

      • Bob April 27, 2020, 3:47 pm

        Well said sir, well said indeed!

      • John Golden April 28, 2020, 2:54 am

        Agree very well said brother

      • Ej harbet April 28, 2020, 7:40 am

        Young men like you will be how this nation stays free.
        In my life time we have restored rights that did not exist when I was 21.I hope from the next world I can see what people like you accomplished when you are my age

    • Big Al 45 April 27, 2020, 9:12 am

      The peanut gallery is down the hall, you’re excused.

    • Awesome Bill from Dawsonville April 27, 2020, 9:42 am

      Please enlighten me…

    • jeff April 27, 2020, 10:03 am

      How is this garbage?

    • Rex April 27, 2020, 10:09 am

      Garbage? Doubtful. Ostensibly, to you, the MDRX is just a scary gun. Maybe you’d be more comfortable having the government mandate which guns the citizen should be allowed to purchase? Not me. The MDRX isn’t on my wish list but I fully support the right of any lawful gun owner to purchase and own one.

      “All it will take will be one idiot…”
      Repeat it’s only a tool, only a tool.

    • Wade April 27, 2020, 10:17 am

      With this sort of inflammatory statement you should back it up with some sort or level of imperial evidence… otherwise why make this sort of statement, you just come angry and ignorant???

      • John Golden April 28, 2020, 2:56 am

        Exactly was thinking the same thing….just a FUDD

    • briguy April 27, 2020, 4:26 pm

      And you don’t think some idiot that uses an M14 or bolt action rifle won’t do the same….?

    • Walley April 27, 2020, 5:08 pm

      Don’t pay attention to Jeffrey. He’s just an agitator stirring the pot and trying to get a reaction…. Which he did.

    • Gus April 28, 2020, 8:21 am

      You sound like another Libturd that just happens to own a gun because you haven’t voted yourself out of one yet. What you know about guns can comfortably fit in a mosquito’s a$$. If you’re going to make ALL gun owners seem like IDIOTS, do all of U.S. a favor, SDSTFU and keep your ignorance to yourself.

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