Angstadt Arms UDP-9 Initial Impressions Tabletop Review

| October 26, 2015 | 9 Comments

Out of everything we saw at SHOT Show 2015, the Angstadt Arms UDP-9 was the overall favorite.

The UDP-9 is an AR15 chambered in 9mm. It is fed by Glock magazines via a custom aluminum lower. The custom aluminum upper has some tricks up its sleeves, too.

I have not gotten to shoot the UDP-9 yet, but overall I think it’s a solid choice for people who are familiar with the AR15 platform, who don’t want to build their own 9mm AR15, and have Glock handguns.


  • Price: $1249 MSRP (unsure if this includes the KAK Industries Shockwave brace)
  • Barrel: 6″ , 1/10 twist
  • B5 Systems grip
  • ODIN Works 5.5″ Keymod handguard
  • Accepts factory Glock and Korean KCI magazines
  • Flared magazine well for easier reloading
  • Slick side upper (no dust cover, no forward assist)
  • 4 pounds, 13 ounces as configured
  • ~23″ long, with Shockwave brace partially extended. Overall length with just the tube is ~22″

Features and Construction

This is covered in the video, so skip down to Observations if you watched the YouTube video already.


The fit and finish of the UDP-9 is great, especially if you’re like me and are coming from the AK and home-built AR15 world. I am particularly fond of the tungsten Cerakote finish. Bronze is also beautiful, but I personally like the muted tones of the tungsten.

The takedown pins, safety lever, and magazine release are all very nice and feel good.

I am waiting to pass judgement on the grip and the trigger until I run this firearm in a more rugged manner, but so far they seem fine.


The flared magazine well is a nice touch. Since I cut my teeth on the AK pattern rifles, anything that isn’t an align-and-rock insertion system seems easy. I’d like to see if the flared mag well makes a huge improvement, but it’s nice to have.


The magazine release is textured, but is also low profile. My primary firearms instructor Erik Pakieser has stated that some students who run AR15 rifles inadvertently depress the standard AR mag catch when putting their trigger finger in a high register index position. The recessed and flat mag release on the UDP-9 should keep that from happening.

I have no experience with this style of magazine release, but it does appear to take more force to depress than the standard button-style release.


Unlike some home-builds, the UPD-9’s bolt carrier group is designed to work with the standard AR hammer and requires no modifications. I think the Angstadt Arms logo is a nice touch.

As far as I know, it’s only available in black; I wonder if they would do a nickle boron BCG in the future.


The BCG also contains a weighted plug. After consulting with Rich Angstadt, it’s possible to remove this plug and attach the bolt carrier group extension necessary to operate the Law Tactical folding adapter. Spoiler alert: I have a Gen 3-M and am going to install it on the UDP as I customize the build.



At about 23″ long and less than 5 pounds unloaded, the UDP-9 is very handy.

Due to the size and weight, I think it would make an excellent weapon for use inside of structures. If you’ve read this blog for awhile you know my opinion on 5.56 / .223 AR15s with barrels shorter than 10.5″, and not everyone wants to shoot .300 Blackout. You could also opt for a suppressor on the 6″ barrel and still have a shorter overall length than most AR15 SBRs.

The short barrel may present a challenge for those not used to a vSBR. I immediately took to putting my other hand on the mag well, as this is how I shoot all of my AK SBRs and my AR15 pistol. The She Shepherd assumed a traditional grip (hand at the furthest comfortable point on the rail). Even with her 5′ 2″ frame remarked how close her hand was to the muzzle.

I recommend running your spare hand on the mag well, but if you did want to use the rail definitely invest in a hand stop.

I am looking forward to putting the Law Tactical Gen 3-M adapter on the UDP-9. I am not sure if it will be smaller / lighter than my .300 Blackout AR15 pistol to replace it, but it might be a great alternative for those of you looking for a compact AR15-pattern firearm for EDC.

Due to my own niche interests, I’d also like to try a 4″ barrel. The AR15 pattern has inherent design constraints that keep it from being truly small, but I think that we could get the UDP-9 a little bit smaller.


This the first firearm in the house with a Keymod rail. I already like the flexibility of the system and the lack of unnecessary rails.

As indicated in the video I am bummed out that the UDP-9 does not accept MagPul Glock mags. All of the spare mags I carry are MagPul 17 mags. While this is not a deal breaker, I was surprised.

I am interested to see if the upcoming magazines by ETS will fit.

Of course, factory Glock mags seat just fine, and the Korean KCI magazine I tried seems to work well. We’ll see as we enter the live-fire part of our evaluation.

I wish the Angstadt Arms Web site allowed for some basic accessorizing; I know this is a testing and evaluation unit but I would have opted for a different grip, ditched the Shockwave Blade brace, and added flip up back up iron sights.

Further Review

I am excited to finally have a UDP-9 in my possession. Our whole crew really liked it at SHOT Show this year, and I think it has great potential for people who are already familiar with the AR15 pattern and also own Glock pistols.

Unfortunately due to weather I’m done training outside until the spring of 2016. I might be able to sneak out to our usual training range and mimic a rifle class, but I am unable to put the UDP-9 through my usual testing.

Expect some sort of live-fire testing in the next few weeks, as well as a build report on what I’ve done to customize the UDP-9 to be more “Shepherd-like.”


The UDP-9 was provided to us by Angstadt Arms for testing and evaluation.

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.
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9 Comments on "Angstadt Arms UDP-9 Initial Impressions Tabletop Review"

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  1. David says:

    The lack of compatibility with Magpul mags is something of a deal-breaker, IMHO. The GL9 is going to become the standard after-market mag in pretty short order. Also, and I realize this is horribly tacticool of me to even ask, do the Korean drums fit?

    Also a little skeptical about the mag release being easily usable under stress.

  2. Chris says:

    What keeps the magpul mags from working?

  3. Bill says:

    As mentioned in the video, all new versions are magpul mag compatible. I confirmed this with the company a few days ago. The magpul mags were not released as the UDP was in initial design but they have since redisgned. I’m currently waiting for one to hit the distributor but I can say the company has been excellent at communication with a quick, professesional, and in-depth response to all of my many questions. I have been debating between a few different 9mm carbine builds all around the same price point. The excellent customer service I’ve seen so far pushed me toward the UDP-9. I hope it shoots just as good.

  4. Terry says:

    Is the UDP-9 piston driven or blow back operated? I understand piston is a better match if you want to connect a suppressor.

  5. Chris says:

    Any experience with the QuarterCircle10 receivers? I’m wondering how they compare.

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