Installing the Law Tactical Gen 3-M Folding Adapter on an Angstadt Arms UDP-9 AR15

| November 18, 2015 | 11 Comments

I was really excited to combine products from two of my favorite companies. It’s like tactical Reese’s peanut butter cups.

I’ve written before about the Gen 3-M folding buffer tube stock adapter from Law Tactical, and we’re in the middle of our evaluation of the Angstadt Arms UDP-9 AR15 that accepts Glock magazines.

Here’s a 12-minute video on how to install a Gen 3-M on the UDP-9. Most of the instructions will apply to a non-9mm AR15 ; there is just an extra step with the UDP-9 due to a weight in the BCG.

Previous articles about the Law Tactical Gen 3 / 3-M


Previous articles about the Angstadt Arms UDP-9



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

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.

11 Comments on "Installing the Law Tactical Gen 3-M Folding Adapter on an Angstadt Arms UDP-9 AR15"

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  1. Terry says:

    sorry for such a long post

    I was hoping you could provide your perspective… I would like to get a compact (SBR) rifle for home defense which I can suppress. I would be the primary user (6ft with long arms), but my wife (5ft, shorter arms) could also be a user and I want her proficient just in case . I already have a Hipoint TS995 in 9mm, but it is a little heavy and long for my wife, and a bit too much kick. It’s probably not practical to make it suppressor ready.

    After posting in the 300blktalk discussion forum, most posters recommended 9mm over 300blk or 556. In an FN forum there were stronger recommendations for the PS90 over 9mm by those who have both (to be expected in an FN forum, I guess). So I’ve narrowed down to a 9mm SBR or a FN PS90 SBR.

    The 9mm would be nice because you can shoot subsonic defensive rounds and the ammo is cheaper. It would be easier to accessorize, too. But I’ve never fired one and don’t know where my wife and I could. If I went that route I’m somewhat inclined to get a complete build like the CMMG MK9 or the Angstadt UDP-9. Or I could go with an outfit like Spike’s and have them build one for me . Many have suggested the CZ Evo, but I do not like the way it feels in hand. I also know many people build an AR piece by piece, and maybe I could do that later, but I’d rather start with something complete and modify it later.

    The PS90 is very compact, has no recoil, and it so light you can hold it with one hand and fire. There is a local gun range which rents one and both my wife and I liked it. I’ve already got a suppressed FiveSeven with a Tactical Solutions Axiom and considered getting a bit shorter or lighter suppressor for it, and put the Axiom onto the PS90. But defensive rounds are supersonic and ammo can be expensive. I’d have to swap out barrels to SBR so there is some cost and labor involved. There are fewer options to accessorize. I also think the unorthodox way you hold it would require a little more practice to be ready to pick it up and go, if ever necessary.

    Whatever I get I would like an airsoft gun with similar controls, for practice moving around the house and could even fire safely in our backyard. I’ve already got several M4 airsoft rifles but would need also need an airsoft PS90 if I went that route (cost about $150).

    Have you also fired a PS90? If so, would you suggest an AR 9mm or a PS90? Are there other considerations to make I haven’t thought about yet?

    Thank you very much!

    • Short Barrel Shepherd Short Barrel Shepherd says:

      Hi there!

      I have fired an NFA registered PS90 with the shorter barrel.

      In my experience the PS90 had extremely low recoil and was very accurate at 40 yards. I didn’t have a chance to shoot it at farther distances.

      I have not fired either the PS90 or a 9mm AR15 suppressed.

      I consider the ammunition scarcity and cost to be big reasons to avoid the platform. I’d expect any student to train with their primary rifle 2 – 4 times a year, with an expected 400 rounds per class. 1600 rounds of 5.7 plus whatever you shoot on your own time seems more difficult to obtain and fund than equivalent 9mm.

      Additionally, if you go the 9mm AR15 route the lower could be used for other calibers.

      The interesting thing about your situation is that you’re already into 5.7 with your sidearm, so the PS90 may make more sense in your situation.

      I agree with your idea to do a factory 9mm AR15 from Angstadt, CMMG, Colt, etc.

      • CR Williams says:

        Another off-the-shelf possibility is the Beretta CX4. About as short as you can get without being an SBR, available in 9mm, rails available for mounting optics and lights and 30rd mags you can get. Or a bullpup in 5.56 that you could suppress, Tavor or AUG. For interior use 5.56 offers some advantages in ammunition choice over 9mm. Interesting possibility, since you’re looking at a tax stamp anyway, is a stocked pistol–not an enclosure, an actual stock. Some are available for Glock pistols, I don’t know about others.

  2. Terry says:

    Wow, thanks for responding! Happy Thanksgiving.

    An appeal of the PS90 is the size and weight, as well as virtually no recoil. I’m thinking this would appeal to my wife. I”m also seeing some very low prices on ammo this weekend (.28 – .32 cents per round).

    The Angstadt is also very light. Do you have any sense how “comfortable” the Angstadt would be for a 5ft woman? What is the recoil like?

    • Short Barrel Shepherd Short Barrel Shepherd says:

      Hi there! The most honest answer I can give you, but probably not the most helpful to you is that everyone has different tolerances and reactions to recoil. The best thing to do is to shoot both weapons, even if they aren’t SBR yet.

      I am not sure where you live, but there may be a shooting range where you could test fire a PS90 and an AR15 9mm, ideally at the same time in the same place.

      Another benefit to the PS90 as an SBR over an AR15 SBR is that the PS90 can be fired at any time, wherease a Law adapter-equipped AR15 will need to have the buffer tube shut in order to fire more than once.

      • Terry says:

        Thanks again. I decided to get a PS90. It may or may not be ideal. However I was able to test fire one of them before and enjoyed it. I would rather spend $1000+ on something I have tried rather than gamble on a firearm I have not even handled.

        This weekend Palmetto State has s sale on 57 target ammo and I was able to purchase it for 0.30 per round and that includes shipping. Also got some defensive SS198 for about 0.75 per round and that’s not bad either.

        • Short Barrel Shepherd Short Barrel Shepherd says:

          Awesome! Once you get your NFA paperwork underway let me know and I will ask my friend from training how he SBRed his. Pretty sure it was a barrel swap.

          • DAN says:

            FYI, I just received SBR tax stamps for two weapons. Turn around time from mailing to BATF and in my mailbox, approved, was 55 days! Surprisingly fast for BATF.

  3. Madison burris says:

    I was inspired and intrigued by your udp modifications with the law tactical.
    After much back and forth I ended up purchasing the same configuration.
    Everything came n and instal of the law tactical went well… except the removal of the weight n the bcg.
    I have not been able to get that hollow pin out to replace the extension that came with the law tactical.
    In your video you went off camera and said you used a punch.
    Is there any more insight or guidance you can offer?
    Any help would be great and much appreciated

    • Short Barrel Shepherd Short Barrel Shepherd says:

      Hi there! I am sorry you are having problems. If I recall, I had to use a punch to remove a roll pin that retained the BCG plug. I used a steel punch just slightly smaller than the roll pin.

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