Streamlight ProTac Rail Mount HL-X PRO

I’ve been a big fan of the ProTac series of long-gun lights for years, and so far, I’ve never had one fail on me. During my time in law enforcement, I’ve used them on my department rifle for search warrants and other activities. I also use them on my personal rifles at home. I was excited to see the HL-X PRO version come out because of its tail cap redundancy switch, which we will discuss further below.

You can mount a ProTac light on a variety of rifles, but the most common is the infamous AR-15. It’s hard to own one without putting something on it. Over the years, I’ve gone through spells where I’d add things and then take them back off. This is often a result of setting up a rifle for a specific purpose. At some point, it’s easier to just build or buy another rifle so you can have them set up for different purposes.

Streamlight Rail Mount HL-X PRO
This light is the perfect size for most full-size and compact rifles. [Photo: Jason Mosher]
Regardless of what I’m setting a rifle up for, I place a light on most of them. Lights are not a hassle when you’re not using them but a huge benefit when you need them. A simple light with a tale switch works great on some setups and is easy to use. But on other rifles, I like mounting my light on the right side with a remote switch to operate it.

With Streamlight’s new ProTac Rail Mount HL-X PRO, you get just about everything you could want in a rifle light. And it sells for a great price. I’ve had my HL-X PRO for a short stint now, and I couldn’t be happier.

Here’s the basics of the ProTac HL-X PRO

This light has several features that make it such a great deal. Depending on what you want with your light, there are a few different price options. The light and mounting kit retail for about $145, which is a great deal. Here are the basic features of the ProTac HL-X PRO.

Multi-Fuel Battery Use

Like many of their lights, the ProTac HL-X PRO is multifuel, meaning it runs on two different types of batteries. First are two CR123A lithium batteries, which are the most popular type for tactical lighting. Second, and my favorite, is the Streamlight SL-B26 rechargeable battery. I’ve said many times in the past that I’m not the biggest fan of rechargeable lights (with internal batteries), at least not for tactical applications.

For home defense and other purposes, they’re great, but if the light goes dead, there’s not a lot you can do. When standard batteries go dead, you can swap them out at any time. When the special response team was deployed, I would change the batteries in all my lights to be safe. With the SL-B26 batteries, I can keep extra ones on me but also charge the old ones for reuse. They are affordable and easy to find, so I have multiple SL-B26 batteries for my Streamlights.

Batteries for ProTac lights.
The ProTac HL-X PRO runs on two CR123A batteries or one Streamlight SL-B126 rechargeable battery. [Photo: Jason Mosher]

Ten Tap Programming

Another great feature of Streamlight products is that they keep the same programming feature with most of their lights. Regardless of the setting options, when you see “Ten Tap” on the light, cycling through those options is the same. Simply press quickly on the power button 10 times and hold down on the tenth press.

This light has three programable features, which include:

  • High Only
  • High – Strobe: Press the power button for the high beam or twice for the strobe.
  • Low – High: The light will turn on in low mode (60 lumens) or high (1,000 lumens) when pressed twice.

Each time you perform the “Ten Tap” function, the light cycles to the next setting and turns off. It will remain in that setting until you change it. I prefer setting 3 for most of my lights. I like to have all the power available when I push the button.

Mounting Kits

When purchasing the Streamlight ProTac HL-X PRO, you can choose from several packages depending on the amount you want to spend. These packages are available as follows:

  • Light and rechargeable battery with Picatinny rail mount
  • Light and rechargeable battery with M-LOK rail mount
  • Light and (2) CR123 batteries, Picatinny rail mount, and M-LOK mount
  • Light and (2) CR123 batteries, Picatinny rail mount, M-LOK mount and remote pressure switch, zip ties, and double-sided tape

Streamlight Rail Mount HLX PRO
I like the M-LOK side mount that comes with the Streamlight Rail Mount HLX PRO. [Photo: Jason Mosher]
I would recommend purchasing the full kit (the last one listed above) because it comes with everything you need to get started. It does not come with a rechargeable battery, but those can be ordered online or found in stores that sell Streamlight products. This gives you the option to move it from a Picatinny to an M-LOK mount or vice versa.

Jack-Cap Redundant Tail-Switch

Here is the best feature of this light, in my opinion. What Streamlight is calling the “jack-cap” is a tail switch with a power button next to the remote pressure switch jack. Before, the tail cap with the push button was replaced with a rear cap with a cord running to the pressure switch. Now, you can mount the ProTac HL-X PRO with a remote pressure pad on your gun and have redundancy.

The power button on the tail cap is small and to the side to make room for the remote switch jack. In case the remote switch is damaged or stops working, you can reach over with your thumb and push the button manually. I had the older version of this light, and it has held up great. Now that I have the new PRO version, I’m going to mount it to my Daniel Defense DDM4 rifle.

Streamlight Rail Mount HLX PRO
The tail switch on the Streamlight Rail Mount HLX PRO has a remote jack next to it, making this a redundant switch system. [Photo: Jason Mosher]

It doesn’t get much better than this!

After using the HL-X PRO on my rifle for a while, I am extremely pleased with it. I like the redundancy of the switches, but I also like using the same tail cap on the light. I’ve lost some of my other tail caps after taking the pressure switch back off the light. When using the Picatinny rail with the quick release, you can unplug the remote switch and use it as a handheld light.

Made from machined aluminum, it’s durable and light, making it perfect for your new AR-15. Streamlight offers a limited lifetime warranty on the ProTac, and its 1,000 lumens are sure to light up anything you need it to. I don’t think I can find anything to complain about with this light. It’s a great long-gun light with lots to offer.

ProTac HL-X PRO Specs

  • Multi-Fuel: Uses one (1) Streamlight SL-B26® protected Li-Ion USB rechargeable battery pack; also accepts two (2) CR123A lithium batteries
  • TEN-TAP® programming allows for the selection of three different operating programs:
    1) high/strobe  2) high only  3) low/high
  • High: 1,000 lumens; 50,000 candela; 447m beam distance; runs 1.25 hours (CR123A); runs 1.75 hours (SL-B26)
  • Low: 60 lumens; 3,100 candela; 111m beam distance; runs 21 hours (CR123A); runs 24 hours (SL-B26)
  • Strobe: runs 2.5 hours (CR123A); runs 3.5 hours (SL-B26)
Sheriff Jason Mosher is a law enforcement generalist instructor as well as a firearms and tactical weapons trainer. Jason graduated from the FBI-LEEDA (Law Enforcement Executive Development Association) and serves as a Sheriff for his day job. When he’s not working, he’s on the range, eating steak, or watching Yellowstone.

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