Simple Threaded Devices 300 Blackout Muzzle Attachment Review

| September 17, 2014 | 2 Comments

People buy different muzzle attachments for their firearms for different reasons. Some try to reduce muzzle climb and buy a brake (or in the case of many AK47s, just leave them on). Some people want to reduce flash, so they buy a flash suppressor. Some people need additional pressure to make their shorter barreled firearm cycle properly, so they buy a booster. And some buy muzzle attachments because they think they look cool.

For my very short barreled weapons like my Mini Draco SBR AK47 or my AR15 pistol in .300 Blackout, I had two simple needs:

  • Protect the threads
  • Get a short muzzle attachment as to not greatly affect overall length.

If you want simple, and you want effective, consider the Simple Threaded Devices attachment.


Retailing for just under $60 on and made here in the United States, the Simple Threaded Device (STD) also serves as a flash hider and also helps reduce concussion. Its appearance and installation is dead simple. Spin the STD onto your barrel, torque it to spec (and/or use a thread locker), and you’re done. You don’t have to worry about timing, or orienting prongs, or a washer, or an O-ring. Keep it simple.

Additional specifications (for the 300 Blackout version):

  • 1.67″ overall length
  • .800″ diameter
  • 2.9 ounces in weight
  • Available in black melonite finish (above) or in satin stainless steel
  • 5/8-24 threads
  • 303 Stainless steel
  • Also available in 5.56
  • Made in Minnesota, USA and the company is owned by a disabled veteran.


Shooting impressions

My STD replaced a Kaw Valley Precision linear compensator. It was nice, but a little long, a little heavy, and resulted in nice little fireballs like this one:



STD muzzle blast 300 blackout

The design of the STD is meant to minimize forward muzzle flash. Meaning, if you’re shooting a weapon with the STD on it, the muzzle flash won’t be readily apparent to you. I didn’t buy an STD to help me with muzzle flash, but I sure did appreciate it when I shot my .300 at a fight-focused low / light night class earlier this year.

Yes, there is some flash, but nothing compared to my linear compensator. Standard Threaded Devices states flash is reduced to the equivalent of a Bic lighter. I was reluctant to hold a lighter to the front of my briefcase blaster while shooting, but I tend to agree. It seemed like someone was turning an LED keychain light on and off when I pressed the trigger.


I did not notice a muzzle blast reduction with the STD, but I have a weird setup. My .300 Blackout pistol has a 6.75″ barrel and I’m running an SIG SAUER SB15 brace on a carbine-length pistol tube. This means the barrel is super short and my face is really close to the muzzle. It is certainly no worse than the KVP linear compensator the STD replaced.

I also admit that I may not be the best test subject for perceived blast. Things get a little hectic when my instructors yell at me while I’m running around during a rifle class.

Durability and Finish

I have a lot of projects going on and almost always use my own money to buy things to review here. So I pinched a few pennies and bought a “blemish” STD. These attachments didn’t meet the quality standards for finish, and were sold at a discount. I went to a local gun store to inspect an STD in person before my “blem” arrived. There was no discernible difference to me. My factory second had an even, dark finish and looked great.

We do some pretty dynamic stuff during training, even at the basic class. We throw ourselves on the ground, shoot through barricades, and use cover. The finish has held up pretty well, but there is a single point on the rim of the STD that has lost its finish (if you scroll up you might be able to see it in the first picture).

None of my firearms are safe queens, so I don’t really care if there’s a nick in the finish. We shoot in the rain frequently so rust / corrosion is all I care about. The 303 stainless steel used to make each STD keeps me from having to worry about rust, unlike several other parts of my ARs.


Buy the STD.

Unless you need to specialized muzzle attachment (e.g., attaching a suppressor, poking people, or adding back pressure) and you are shooting either 5.56 or .300 Blackout, the STD is an obvious choice. I intend to buy additional ones for my future .300 builds. It is short, lightweight, simple to attach, helps save your night vision and may help your impression of muzzle blast.

For $59 shipped via Amazon Prime, I think the STD is a great deal. Remember you’ll be supporting a disabled veteran-owned company right here in the USA.

My only criticism is that they don’t make one for 7.62×39 — I have six AKs who are anxious to contract an STD 😉


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.

2 Comments on "Simple Threaded Devices 300 Blackout Muzzle Attachment Review"

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  1. David says:

    What, no Amazon link with referral kick-back? MONETIZE! (I am being serious here.)

    Anyways, this looks like a really nice muzzle device for shorty builds. I’d like to see it side by side with an A2 FH for length-comparison purposes.

    • Short Barrel Shepherd Short Barrel Shepherd says:

      I published this without the Affiliate cards, but they should show up now. I wonder if the old version is stuck in our Amazon Cloud cache.

      Thanks for pointing this out, though!

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