Walker Defense has come on the market with some truly innovative products. One of those is the NERO 556, a 3D printed hybrid muzzle brake/compensator manufactured from Inconel.. By using state of the art 3D manufacturing, Walker Defense was able to design the NERO without the constraints of normal machining. I had watched one of their videos on the NERO and needed to see if it was really that good, so I reached out to them for a review sample.

3D manufacturing brings a whole new level to muzzle brakes. Walker Defense uses an additive manufacturing process called DMLS (Direct Metal Laser Sintering). Basically this process uses a laser to melt powdered metal together. By using this process, Walker Defense was able to design a muzzle brake that doesn’t have to use standard machining processes. Instead, they designed it using fluid dynamics for the best possible reduction in muzzle rise and recoil.

The NERO 556 is manufactured using inconel. Inconel is a superalloy known for its resistance to heat, pressure, and corrosion. You may have heard about inconel because some suppressor companies use it for the initial blast baffle. Inconel is not the easiest metal to machine and thus can add a huge cost. By laser sintering the inconel, costs can be kept down some.

Walker designed the NERO for zero muzzle rise. It is optimized for a 14.5” or 16” 5.56 (.223) barrel length. If you run it on a shorter barrel, it definitely pushes the muzzle down. I know this because I tried it on a 11.5” and a 7.5”. It does this because the pressure going through the NERO is much larger on the shorter barrels. Walker Defense actually sent me a cutaway diagram (see picture). The diagram helps to understand what is going on with the NERO, and why it looks the way it does. As Walker Defense mentioned:

“It (nero) was designed using fluid dynamics to force the gases to take a different trajectory than the bullet. Upon entering the muzzle device, the vectored flow nozzle (#1) acts as an inverted ramp, and along the dimpled compression ramp (#2), focuses a jet of gas into the curved blast surface (#3) directly below the bore. This focused gas striking the curved blast surface is intended to create a balanced counter-recoil force that directly counteracts the rearward and upward recoil with a downward and forward counter force.”

Now that we know the technical description, here is my take. The NERO 556 works like nothing else I have ever used before! Like I mentioned earlier, I did try it on a 11.5” and 7.5”, but most of the use was on a 16” barrel. Running the NERO on the 16” did exactly as stated. Recoil was reduced extremely. Most importantly, muzzle rise was effectively eliminated. The recoil impulse almost felt as if it was slightly pulling away from my shoulder. When I tried it on the short barrels, results varied. On the 11.5”, recoil was reduced and the muzzle dipped a little during recoil. On the 7.5”, recoil was reduced also, but more importantly was the huge downward force pushing the muzzle down. I would recommend also running it on a 14.5” or 16”, as it was designed for that. With the shorter barrels, there was also more concussion from the blast. With the 16”, I didn’t really notice it, as it is less than other muzzle brakes I own. While shooting a standard USPSA target, at ranges from 5-25 yards, A-zone hits were really easy. Even when I shot really fast, the muzzle stayed on target and the hits were all on the target. FYI, the AR15 that the NERO resides on weighs in at 6 pounds empty.

Walker Defense also noted about handling the rifle differently. When shooters use the NERO for the first time, some have a tendency to pull the muzzle down during recoil. With the NERO, this is definitely not needed. Since I was warned about this, I literally shot the rifle with the handguard resting on a flat hand, after first installing the NERO. Yes, it shot very flat with no support. However, I did go back to my standard grip without any problems.

I was trying to measure recoil and give a comparison, but the data wasn’t there. I did get a few decent readings on muzzle rise (see attached screenshots). The last one in the group is always off because I moved the rifle after the last round was fired. All of the ones I have are in the standing, off hand, position. The average muzzle rise is near zero. This is consistent with what Walker Defense say about the NERO.

The NERO 556 may not be for everyone, but it should be. If you are a competitive shooter, you need this. If you just want reduced muzzle climb, you need this. If you want faster follow up shots, this will definitely help. The NERO may seem pricey at first, but after shooting with it, you will probably change your mind. The videos put out by Walker Defense really are how the NERO shoots.

The NERO is definitely innovative. Just by looking at it, the NERO 556 doesn’t look like your normal compensator/muzzle brake. Well, it isn’t, thanks to the 3D design and sintering. If you want an awesome, recoil and muzzle rise reducing, muzzle brake, look no further than the NERO from Walker Defense Research.

Firearms Insider Reviews - 8 Key Points

Claim to Fame:

3D printed muzzle brake with soft recoil and ZERO muzzle rise

Target Market:

Those wanting the best technology in a muzzle brake

FNBs (Features & Benefits of this product):

Reduced Recoil
Minimal muzzle climb
Standard ½-28 thread pitch
Use on .223 Remington, 5.56 NATO, .224 Valkyrie
Inconel 718
PVD coated
Pre-drilled hole for pinning and welding on 14.5” barrel
Direct Metal Laser Sintered
Weight: 3 ⅝ ounces
Length: 2.6 inches
Individual Serial Numbers
Optimized for 14.5”-16” barrels

What other aesthetic options or finishes are available?

NERO 9 and NERO 762

What others are saying?:

5/5 stars Carl @ Walker Defense Research

Incredible Upgrade

There are lots of ways to spend money on AR-15’s these days... The Nero 556 is one modification that made an immediate, substantial improvement to performance of my AR. Muzzle rise was virtually eliminated allowing for faster and more accurate follow up shots. My buddy’s girlfriend had never shot a rifle and handled it with ease. It is well made and installed easily. I will be buying more!