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Interestingly, talking to different suppressor makers turns up a sometimes wildly different sales mix. Some will have their rimfire cans outselling everything else combined, 10 to one. Others have a 50/50 mix, some have heavy sales in pistol calibers, and some find the lightweight suppressors sell better than the heavy ones.

One thing is consistent across the board: Buyers of 5.56 suppressors are interested in durability. Oh, some say they want the quietest suppressor to be had, but they will prove that assertion wrong when they shoot to heat up their suppressor and giggle while it smokes.

If what you want is a not-heavy suppressor, with perhaps excessive durability, and a great big dollop of quiet as well, then Yankee Hill can provide you with just that.

The Yankee Hill Machine 5.56 Turbo was introduced in 2017, when it won awards for obvious reasons.

The Turbo was the Yankee Hill offering that started the welded-tube construction for them. The process is simple: the baffles are not stuffed into a tube, as in older designs. Instead, the front edge of the baffle skirt is welded to the back shoulder of the baffle ahead of it. The front and rear caps are welded to the assembly, creating a one-piece suppressor that has more internal volume (no external tube to take up space) and less weight, also because of no external tube.

The baffles and caps are made of 17-4 stainless steel, a popular alloy for this application for several reasons. The alloy contains about 15% chromium and 4% nickel, as well as a smidge of copper. It is extremely corrosion-resistant, it can be hardened (although repeated shooting to heat it up to red-hot is going to take some of that hardness away), and it machines well.

Now, to make the assembly even tougher, Yankee Hill replaces the first baffle the gases encounter, and replaces it with one made of Inconel. When it comes to corrosion and abrasion resistance, Inconel is much better than 17-4 stainless. It is a lot more expensive, and welding it can be a pain. Why not make the whole suppressor of Inconel? Because once the gases have slammed into the first baffle--the expansion chamber baffle--the rest of the baffles, made of 17-4, can easily handle the job further forward. Making a suppressor entirely of Inconel would be overkill. And expensive.

The mounting system Yankee Hill chose for the Turbo is its QD system, which can be had in either flash hider or muzzle brake configurations. The mount uses a spring-loaded collar behind a fast-pitch Acme thread, and the rear of the Turbo has a series of ratchet teeth cut into it. The teeth of the Turbo contact the locking ridges on the mount, and "brrrrk!" your turbo is locked onto the mount, in a turn and a half.

The Turbo comes with a mount, instructions, and a thread specification drawing in case you have to have a gunsmith machine the muzzle of your rifle.

The Turbo is meant for use on 5.56 rifles, with barrels down to 10.5 inches in length. Now, you could easily use it on something smaller. If you wanted to suppress a .222 Remington, or a .222 Remington Magnum, those are so close to the .223/5.56, I'm not sure the Turbo would notice. Especially since you are highly unlikely to have an SBR chambered in those. A .22 Hornet or K-Hornet would be an inconsequential caliber, as far as the Turbo is concerned.

I would be reluctant to go bigger than the .2221.223 family. For instance, the .224 Valkyrie looks to me to be at the limit the Turbo would be happy with. A .223 with a 55-grain bullet would be using 26 to 27 grains of powder. The Valkyrie would be using 28-29 grains. Were I to get bold and put a Turbo on a Valkyrie, it certainly would not be on an SBR. (But then, since the raison d'etre of the Valkyrie is velocity, barrels will likely be 20 inches or longer.)

Bigger cases than that? Nope, not me. Also, do not entertain the idea of using the Turbo with a rimfire firearm, unless that rimfire caliber is loaded only with jacketed bullets. Since the Turbo is one piece, and cannot be taken apart, and your usual rimfire cartridges run really, really dirty, the two would be a bad combination. I've seen pistol-caliber and rimfire suppressors that had not been cleaned, and they were caked with powder residue and lead particles--so much so that they could no longer be disassembled (that's how you clean a rimfire suppressor) and had to be cut in two to demonstrate the buildup.

It isn't the rimfire aspect that causes the problem, but the unprotected lead bullets, as are common on .22LR ammunition. Yankee Hill might not mention it in the literature, but the .22 rimfire magnums, the .17s and the like, with jacketed bullets, would be fine. Although, were I using the Turbo on one of those, I'd follow a rimfire session with a heavy-duty .223/5.56 session to burn out any leftover powder residues that might want to be building up.

That's how centerfire suppressors stay clean: They run so hot they burn out the left-behind whatever. You cannot, however, heat up a centerfire suppressor enough to clean it out after a plinking session of .22LRs, and you can run the Turbo hot, since it is full-auto rated, and nothing heats up a suppressor like bursts.

The decibel testing of the Turbo that Yankee Hill has done is impressive. Using an AR with a 14-inch barrel and 55-grain ammunition, YHM gained a 134 dB reading, which is considered by many to be in the hearing-safe range.

The construction of the Turbo makes it durable, and it makes it light as well. At 13.5 ounces, it is not the most portly suppressor on the market. But the added durability of the materials and construction are worth the extra ounce or two it may or may not have over its competitors.

For testing, I had two sample firearms to use. One is an AR pistol in 5.56 that already has a Yankee Hill QD mount on it. The barrel is a salvaged one from an LE class, and, while it works, I have never tested the barrel for accuracy beyond "minute of felon" range work. It hits what I'm aiming at, but beyond that, I've never exploited its potential. (Who has the time?)

The second one is a SIG M400 SBR that came through here, was ultra reliable and accurate, and which I refused to let leave. So I grabbed a scope in rings on hand, parked it on top, and used that as the accuracy tester, while checking function with both firearms.

You can figure the results of reliability and quiet. Yes, and yes.

The short length and light weight of the Turbo will make it popular with shooters who want to put a suppressor on a carbine or an SBR or AR pistol, as it hardly adds any length to the setup. An SBR with the common barrel length of 10.5 inches will end up no longer than a vanilla-plain carbine with a barrel of 16 inches.

On top, for testing, I grabbed a setup off the shelf that was ready to go. This is a Geissele Super Precision mount, and a Meopta 1-4x22 scope. Granted, a 4X scope is not what you'd want to be using if you were interested solely in demonstrating maximum precision. But, on an SBR or AR pistol, do you really want a 3.5-10x50 scope? That's a bit much for a "truck gun."

The accuracy testing demonstrated that when you're on, the magnification of the scope is not a big deal. Even with "only" a 4X scope, I was able to punch some nice-sized clusters.

But wait, the best part was saved for last: the price. When I began testing suppressors, it was not uncommon for a basic, compared to today, no-frills suppressor to cost a grand. Add in a few extras, like a QD mount system, and you could easily push the cost of a suppressor up past the average mortgage payment of someone in the bottom end of the upper 10% income. Translation: more than $1,200 in today's money. The MSRP of the Turbo? A mere $489.

That's right, about the monthly payment for a Chevy Silverado 1500 4X2 regular cab pickup, with a decent trade-in.

Holy quiet shooting, Batman! For one month's payment of the Chevy note, you get a quiet, short, durable suppressor for your AR pistol--a combo that will fit nicely behind the seat of that same truck? It's almost enough for me to give up Fords.


The SIG M400 is SIG's take on the ubiquitous M4, but with improvements that SIG felt were needed. The receivers fit properly, the barrel is cold hammer-forged, the parts that need to be mil-spec are, and those that aren't, are better.

My M400 dates from the early days of the introduction, and as a result, it seems a bit, well, staid. The handguard on mine is quad rail, the trigger uses mil-spec parts that have been cleaned up and tuned for a better trigger pull, and the stock is an M4 slider with the SIG logo on it.

Now, you get everything better. The current SIG M400s come with MLok free-float handguards, SIG pistol grips, improved trigger, and six-position tele-stocks that are more comfortable and have QD sling sockets built in.

The barrel on my M400 is brilliant. Even after a full-auto mag dump demo (with suppressor) done for TV, it remains a tack driver. When I get a chance, I'll have to rebuild it up to the current M400 or M400 Elite standard. But until then, it puts bullet holes into tiny clusters, and does so with the regularity of the dawn.


Not every firearm comes here with a pedigree. The barrel on this pistol came to me from an LE class. You see, it is un-marked, and the owner could not remember where it came from. (Cue theme music: the barrel with no name.) The front-sight assembly had been held in place with four tiny set-screws, and the owner got tired of it always being off-zero, or even not working, from the sight being bumped and tilted. He had a replacement barrel, and I got to keep the old one for swapping the parts.

With a bit of work on the drill press, I was able to dimple the barrel enough at the set-screws to make them actually work, more or less. I then plugged it into the upper on an AR pistol, and proceeded to abuse it as a test mule.

When I began testing suppressors, it received a Yankee Hill mount, and the abuse got even worse. So bad, in fact, that the YHM QD mount is now both rusty and crusty from copper oxidation. But the pistol continues to work, and the setup hits where I'm aiming. The 12-inch twist of the barrel does limit it to 55-grain bullets or similar, but since that is what a whole lot of AR shooters use, I don't see it as a hindrance. And the testing for this article shows me that it is actually a very nicely accurate barrel. Perhaps I should not abuse it so much.

Regardless, for a free barrel, it has provided me a great deal of practice and testing knowledge.

I'll be sorry to see it go, when it tells me it is done.


There is no such thing as "one size fits all" when it comes to suppressor mounts. Each manufacturer is free to make whatever mount it feels is best, appropriate, or cool, as a means of mounting its suppressors. In the scheme of things, the real world will sort out what works. Well, the Yankee Hill mount works. In the course of testing suppressors for Firearms News, I have done heinous things to silencers. The YHM mount on my AR pistol demonstrates that, as it is crusty with rust, streaked with copper oxidation, and yet it works.

Each YHM suppressor I've put on it has lined up just fine, centered perfectly, and the mount and suppressor have survived my abuse.

Now, not every suppressor maker feels it is necessary to have a proprietary mount. Some of them will make their suppressors in "other people's mount" and YHM is one I know several suppressor makers will build for.

So, it is possible to have more than one brand of suppressor to mount on your YHM muzzle device. Do I ever see a day when there are two or three "standard" suppressor mounts, that all manufacturers build to? Nope. But I do foresee a day when the government adopts a given suppressor, and all of a sudden everyone who makes suppressors offers their silencers in their own mount, and the government mount, your choice.

Caption: If you want compact and durable in 5.56 suppressors, the Yankee Hill Machine Turbo is a hard one to beat.

Caption: On the rear of the Turbo, you can see the ratchet teeth deep inside there; there is an Inconel baffle, to take the initial hit of hot, abrasive gases on each shot.

Caption: The Turbo is built for center-fire cartridges, it can't be disassembled, so keep the rimfires away. Unless, of course, your rim-fire uses jacketed bullets.

Caption: On the left, my SIG M400, which is a veritable tack driver, despite the full-auto abuse I have heaped on its bore. On the right, my test mule AR pistol, with its salvage barrel, which turns out to be a pretty accurate tube. Maybe I shouldn't abuse it so much. Nah.

Caption: Yankee Hill reports a 134 dB reading on an M4-length barrel and 55-grain ammo. On an SBR with an 11.5-inch barrel, the combo is light, handy, quiet and accurate.

Caption: The SBR and the pistol, with groups they fired. At 4X, these are really good, and the shift in zero and size between suppressed and un-suppressed? None to speak of.

Caption: Yankee Hill makes flash hiders and muzzle brakes as suppressor mounts. The style changes now and then (the rust is an option you have to handle yourself) but they all work on all caliber-appropriate firearms and suppressors.

Caption: My YHM suppressor mount has been abused, neglected, allowed to rust, and still works just fine. You should not do this, but if you do, you can be sure yours will still serve you well.

SIG M400 with YHM Turbo & Meopta @ 4X

Brand and Bullet      Weight   Velocity    sD      Accuracy,
                      (gr.)     (fps)             Avg. & Best

Black Hills FMJ         55       2695     21.9   1.75" / 1.25"
Black Hills V-Max       60       2696     22.7     1.5" / 1"
Winchester FMJ          55       2611     27.2   1.75" / 1.25"
Federal XM-193 FMJ      55       2729     23.3   1.75" / 1.5"

Accuracy results are the average of five, five-shot groups, over a
Sinclaire shooting rest, at 100 yards with Leupold at 9X power.
Velocity is the average of 10 shots, measured by a Labradar chrono,
programmed to measure velocity 15 feet from the muzzle.


OAL:                        6.5"

Net Length                  5.5"
Added To Firearm:

Diameter:                   1.562"

Material:                   17-4 PH stainless,
                            lnconel blast baffle

Weight:                     13.5 oz.

Finish:                     Cerakote matte black

Calibers Available:         5.56, and smaller centerfires

Full-auto Rated:            Yes

Mount Systems Available:    YHM QD

MSRP:                       $489

Yankee Hill Minimum         5.56 NATO/10.5"
Barrel Suggestion:
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Article Details
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Author:Sweeney, Patrick
Publication:Firearms News
Date:Jan 1, 2019

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