Angstadt Arms UDP-9 9mm AR15 SHOT Show 2015 Interview

| February 3, 2015 | 4 Comments

One of the best things about SHOT Show is meeting new people. While on the way to another booth, one of our videographers shouted, “hey, check out this 9mm AR.” We were glad we stopped. The UDP-9 was one of our crew’s favorite things at SHOT Show 2015, and North Carolina-based Angstadt Arms is chock full of good people.


Shown here with an optional Law Tactical folding adapter, the Angstadt Arms UDP-9 is a custom 9mm AR15 designed to take Glock magazines.

Weighing in at less than five pounds (depending on options), the UDP-9 is equipped with a 6″ barrel. Angstadt is going to sell a pistol version as well as a factory SBR.

The pistol option comes with:

  • 7075-T6 billet aluminum lower and upper receiver with a matte black hard-coat anodized finish
  • Flared magwell for faster reloads, integrated, oversized trigger guard and a threaded bolt catch screw
  • Last round bolt hold open on an empty magazine
  • Slick side upper receiver with appropriately sized ejection port and no forward assist or dust cover
  • 9mm bolt assembly for use with a standard AR-15 hammer. Compatible with both Glock and Colt 9mm AR-15’s
  • 6” 9mm barrel in chrome moly with a 1/10 twist, black phosphate finish and A2 style flash hider
  • B5 Systems pistol grip
  • ODIN Works 5.5” free float keymod hand guard with continuous top picatinny rail and mounting positions at 3, 6, and 9 o’clock.

The pistol UDP-9 is 21″ long. Given my knowledge of the Law Adapter’s size and the length of a typical A2-style flash hider, I’m going to guess the folded length will be somewhere between 16.5 – 17.25″

During our interview, Rich stated the barrel was 5″, but the Web site says 6.” The ODIN Works hand guard is 5.5″ long, so in looking at the UDP-9 it probably has a 6″ barrel.

The MSRP on the pistol is $1249. The SBR option is approximately $1350, but will depend on options. There may or may not be a pistol brace option depending on what kind of dealer pricing Angstadt can get from SIG.

I would highly highly recommend getting one with a Law Tactical adapter, which should bump the price up by at least another $220 or so.

All of the internals are compatible with regular AR15 parts except for the magazine catch, bolt hold open, and ejector.

If you wish, you could also shoot .40 S&W or .357 Sig out of this platform with a barrel and bolt swap. No word on pricing or availability on conversion from Angstadt, but I imagine they’ll concentrate on fulfilling 9mm first before going to different barrels and bolts.



The UDP-9 looks really well built. After reading (and hearing) reader horror stories about trying to get Glock-lower AR15s to run I am excited to see a factory option from a smaller shop like Angstadt. This is the only product they build, and that kind of focus is critical for fulfillment and fine tuning.

Estimated availability is April of 2015, with direct ordering from and available from some as-yet announced firearms retailers.

Personal Observations

The UDP-9 may replace my NFA Glock as our intermediate-sized 9mm SBR of choice. While I’m not super fond of the AR platform, I do think the regular manual of arms is helpful. We are a “Glock house” over here, and magazine commonality is a big bonus. In training it was beneficial to trade magazines back and forth with the She Shepherd during partner shooting drills. Keeping 33-round magazines in one bag that can serve three firearms (our handguns plus the UDP-9). If we also get the Glock-friendly MasterPiece Arms MAC-10 DMG, that ups magazine compatibility to four.


If I were to get a custom UDP-9, I’d drop the barrel down to 5″ or maybe even 4.” I would want a Law adapter (of course) and would beg Simple Threaded Devices to make a 9mm muzzle attachment. I’d add a MagPul BAD lever for commonality across our AR15 firearms. If money was no object I might put a Trijicon RMR RM07 on top, otherwise I’d go with my standby MD-07 from Primary Arms or perhaps their new hyper-long battery life model. The tungsten color is really beautiful.

In doing the price comparison to other AR15-ish 9mm firearms, the Angstadt is at a fair price. The X Products side charging upper we saw at SHOT Show is another interesting option, but the upper alone is almost $1000.

The TNW Firearms Aero Survival Pistol is much less expensive for a complete firearm, but it’s not compatible with the Law Tactical adapter, which limits its usefulness for EDC.

Some may be able to save some money by building their own AR15 out of common parts, but most readers who have contacted me about personally-assembled 9mm AR15s say there’s some fine tuning and parts swapping to be done. I’m not sure if there’s a huge cost savings over buying the UDP-9 once you factor in time and “experimenting.” Of course, some of us love experimenting, and there may be a personally assessed value there.


I think the Angstadt Arms UDP-9 is a great commercially made 9mm AR15. The parts, build quality, and balance seem great, and I think the price is very reasonable for what you get.

Thanks to them for taking time to chat with us at SHOT Show 2015, and we hope to see them again soon.

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.

4 Comments on "Angstadt Arms UDP-9 9mm AR15 SHOT Show 2015 Interview"

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  1. Jim says:

    Given your prior comments about pistol caliber ballistics and the UDP price point I would think a 7.5″ AR pistol would be a better choice. More umph for less $$.

    • Short Barrel Shepherd Short Barrel Shepherd says:

      Hi there — if going purely from ballistics, you’re right. Very few (10mm comes to mind) pistol cartridges come close to vSBR rifle rounds.

      However, there are other factors to consider, including weight of the firearm and ammunition, quantity of ammunition, magazine dimensions, and the shooter’s ability to handle recoil.

      I don’t mind shooting my 6.75″ .300 Blackout pistol, but I do know that it is far easier for me to shoot a four round burst of 9mm from a Glock enclosure than a two round from the .300.

      I’m not disagreeing with you at all, just suggesting there are other factors that need to be considered than just ballistics.

      Thanks for reading and commenting.

      • Jim says:

        SBS – thanks for the additional advice. Love your columns and postings. I am learning more all the time. You’ve already influenced and narrowed my handgun inventory, now I’m reading and studying all I can before deciding on the next step. Of course more training is always required.

  2. Martin Luther says:

    In 357 sig I think this would really shine. You don’t gain much in velocity with 9mm in this length of barrel. Now as to Jim’s comment a 7.5″ AR in 300 blackout would be better in many ways if you can afford the ammo. In 5.56mm I would be concerned with reliability and poor terminal ballistics from that length of barrel.

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