The Desert Tech MDR in 5.56

There has been lots of excitement surrounding the Desert Tech MDR lately. With some rifles shipping since late last year, and many more about to drop, the hype has reached its peak. The Micro Dynamic Rifle  brings Desert Tech’s multi caliber capability to a an auto loading rifle. All of the rifles that have been delivered to customer so far have been 7.62 rifles, but I got a lucky chance to get an up close look at some of the first 5.56 rifles. After a few hours of shooting it, I decided to write a little more about it.

The MDR is a bullpup rifle, and currently there are 7.62 and 5.56 conversions available for it. I have spent extensive time with the 7.62 versions of the rifle, and have found it to be a very fun rifle. The function of the rifle is very intuitive, the controls may take a moment to get used to but are otherwise very friendly. In my experience, the controls wear in with use, and only get better. The initial feel is that the mag release is stiff, and the trigger can be a bit scratchy. But with some range time, both of those issues go away, and the trigger is quite nice. I dont even think about the mag release anymore, it is smooth and easy to operate.

The MDR has big shoes to fill. As many of you are aware, Desert Tech makes some of the best precision rifles available today. And having sired the MDR, Desert Tech is expected to bring the same quality and presentation its other rifles are famous for. Quality triggers, better accuracy than the competition, all in a multi-caliber rifle shorter than its peers.

Having had plenty of trigger time with the 7.62 version of the MDR, I was very excited to try out the smaller conversion in 223/556. I was actually lucky enough to assemble the rifle from scratch. Or at least, from a small pile of parts. Click here to see assembly.

After some humbling experiences, I was happy to see the gun work like it had been built by the pros. It took very minimal tuning to get the rifle running just like a swiss watch. It was time to take it out into the wild, and get it hot.


Coldboremiracle Junior feeling out the MDR

The 5.56 MDR was a dream to shoot, comparing it to the 7.62 version of the rifle, which has significantly more bark. Recoil was negligible, a smooth and solid impulse. The ejections system pumped the hot brass out forward and to my right, making nice little piles. The rifle manages almost like a pistol, it is very easy to keep on target even during sustained firing. I used the gas block mounted Desert Tech Reflex Optic for much of the shooting. But it didn’t take long for the marksman in me to come out, so I switched over to a Kahles 312i for some accuracy testing. After all, only accurate guns are interesting, at least to me.

I also couldn’t pass up the opportunity to try out my new Yankee Hill Machine Turbo 556 suppressor. The MDR was a perfect host for it, and its uncivilized to shoot unsuppressed. You can read more about the Turbo here.

I was shooting some 55 grain ball ammo for the majority of the trip. This same ammo usually prints groups in the one inch category with my other custom 223 rifles, and in the MDR it was about the same. Five shots was probably just under an inch at 100 yards. I also wanted to try one of my pet AR loads for long range, which included a Hornady 75 grain BTHP and some RL-15.

After getting the rifle sighted in, I was quite impressed with the MDR’s accuracy. This was the first group I shot after zeroing the rifle, its only three shots but clearly shows the rifle’s potential.  The MDR clearly likes this load with the Hornady’s, so I may have to revisit with more ammo , and more range.

The rifle functioned great through the three or four hundred rounds that I put through it. There were only a couple issues that I quickly resolved, a spring that is part of the ejection system had not been installed properly. I cant blame anyone but myself there, and after I corrected the problem it was flawless.

I tried out several different magazines in the rifle. First I had to try the classic GI metal magazines that surely litter ever gun room across the country. The mags fit perfectly, fed like a million bucks, and even dropped clear with no need for assistance. I also had a couple Brownells Gi clone magazines. I bought them a few years ago on sale, as far as I can tell they did a great job cloning the old magazines but with new coatings and Brownells quality. In addition to those two types, I also tried out some standard Magpul Pmags, in both 20 round, and 30 round configurations. I am happy to report that all of them worked great, no feeding issues at all. That should come as good news to all those prospective MDR owners who already have a broad magazine inventory.

Another big concern to those interested in the MDR is the adjustable gas system. The rifle I build had a three position gas selector, though I understand that a selector with more settings (five or six) will soon be available for all MDR rifles. That said, this rifle worked great with the standard three position gas selector. I ran it on adverse for the first hundred or so rounds, to help break it in. I then changed it over to normal, and then to the suppressed setting when I attached the suppressor. I can see where a gas valve with more choices would be helpful, as even on the suppressed setting there was enough gas exiting the receiver that I could smell it. But honestly it wasn’t a big deal to me, I kept shooting along without any concern. If you shoot in an enclosed or indoor range, I could see it maybe becoming an issue. But easily resolved with a lower gas setting.

I also decided to see how the gun would run without the ejection chute installed, I have seen and been asked many times how it works. For me it isn’t a big issue, since in my experience most ejection issues/jams in the MDR are not related to the chute. But I can understand why some would want to know, so I gave it a try. With the chute removed, the gun ejected brass directly out and to the rear, about to my four or five o’clock. It occasionally would throw one to the three o’clock, but it didn’t seem to care, as it continued to chew through the rounds. Speaking of chewing, the 556 conversion on the MDR seems to be fairly mild on the brass. I assume it is because of the larger extractor to rim ratio, as well a smaller gas volume and recoil impulse.

My overall impression with the 556 MDR was one of pure enjoyment. Perhaps Im just used to shooting the 762 version, and other heavier recoiling rifles, but I just couldn’t stop pulling the trigger on this gun. The accuracy makes this rifle at the top of my wish list, and I intend on getting some more time behind it soon. Perhaps a coyote hunt or some other adventure. I will be getting one as soon as conditions permit, and probably a 6.5Creedmoor barrel to go with it for more serious work such as distance.

For those of you waiting for the 556 MDR, hang in there if you can, it is worth it.


Oh Wait! there’s a Video too:

3 thoughts on “The Desert Tech MDR in 5.56

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