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Quick Notes On The Primary Arms Ultimate Weaponlight

When buying parts hither and yon for my ARs, my original plan was to mount my favorite weaponlight, the LED Streamlight TLR-1 to a short rail stub on the handguards. But for Reasons(tm) (possibly curiosity or browsing the internets while drinking), I ended up with a Primary Arms 3x CR123 LED “Ultimate Weaponlight”. It sells for $90 and promises 450 lumens for 2.5 hours on 3 batteries. It comes with a mount and has an inexpensive optional tape switch, and is also available in FDE.

At 8oz, it is twice the weight of a TLR-1, and that much mass hanging at the end of your rifle is noticeable. Despite being made in China, it does seem to be constructed well and solidly fits the Magpul MOE rail stub. It does throw an impressive amount of light, taking it (detached from the rifle!) outside at night, I could easily spotlight stuff down the street. I like the operation of the clicky tailcap, it doesn’t offer any modes other than off or on, and has both a momentary on and a latching on/off.


I can’t offer any opinions on battery life, durability or longevity yet, but the light and switch still function well after about 300 rounds of zeroing and function testing.

So is 450 lumens too much for indoors? I don’t think so, but you do have to be more mindful of white walls, mirrors and glass picture frames. Rehearsing your ninja pie-moves inside your house during the daylight hours is time well spent. Remember always that a light on your gun isn’t a flashlight with a gun on it, but a gun with a flashlight on it. You must never directly point the flashlight (and therefore the gun) at anything that you aren’t willing to put a bullet through. Get in the habit of illuminating rooms by pointing the light beam at the floor.

One problem, the mount was loose after about 200 rounds. The mount is two pieces held together by these two small Phillips head screws on the opposite side from the thumbscrews.


These screws loosened up and the mount was fine after I tightened them down. When I got home, I added some blue locktite and screwed them down again. If you get one, I recommend you do the same.

Anyway, so far, so good. I really can’t unreservedly recommend it, but I can’t tell you not to try one either. Primary Arms is a good crew and has a reputation for responsive customer service. If you need a longer light throw distance than a TLR-1 but can’t afford a Surefire Scout light, I think this has a lot going for it.

{ 3 } Comments

  1. Jay G. | March 1, 2013 at 9:02 am | Permalink

    What kind of half-baked review is this? You don’t even mention if it holds zero…

  2. Daniel Borntreger | March 1, 2013 at 10:28 pm | Permalink

    I have one and had the same issue with two little screws.. Tightened them up and no problems.. It’s a flashlight not a laser.. Yes it holds zero!!!

  3. Brett DiMichele | July 7, 2013 at 8:03 pm | Permalink

    Just posting this for anyone with the UWL. The reason the screws come loose is that they purposely did not apply any blue thread locker so that you can remove the mount and switch over to any of the “170” Surefire mounts (LaRue, American Defense, ARMS etc). If you are going to stay with the Primary Arms mount they recommend you apply a thread locker to the screws. If you ever plan on removing it, use blue thread locker. If you are 100% sure you will never remove it, use red thread locker.

    Love my new PA UWL!

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