Preface
I’ve been shooting Yankee Hill Machine (YHM) suppressors for several decades now, and I can say with confidence that it has been a good experience. Suppressors have become an everyday thing for me, I use them on most of my guns. I’ve got a variety of suppressors from various manufacturers, but I keep coming back to YHM for good reasons. Today I am happy to bring you yet another new to me suppressor from the good folks at YHM. That can is the YHM Fat Cat 5.56 suppressor, a compact can designed for hard use on your auto-loading 5.56 rifles.
YHM Fat Cat Specifications
| Caliber | 5.56mm |
| Weight | 11.2 oz/ 13.2 oz with adaptor |
| Length | 4.25 in/4.50 in with adaptor |
| Diameter | 1.94 in |
| Material | 17-4 Stainless steel/ Cobalt 6 |
| Included Mount | sRx Ā½-28 QD adaptor |
| Decibel rating | 139 dB |
| Min Barrel length | 10 in |
| Full Auto-rated | Yes |
Compact and Compatible
The YHM Fat Cat is a compact suppressor, a trend that has gained some popularity as the suppressor market has grown. K cans have been around for a long time, and offer shorter overall weapon lengths. But the Fat Cat falls into a different category, a short and fat category. There are a few different options out there that offer short cans with larger diameters, the idea behind them is that the greater diameter of the suppressor aids in its effectiveness.
The Fat Cat from Yankee Hill Machine incorporates many of the companies other features as well. Using the industry standard hub allows you to use whatever mounting system you prefer. The Fat Cat comes with the newer sRx system, which is compact in its own right. But other options can also be used, like the Phantom QD system, or various direct thread options. And thats just some of the YHM mount options, you could also use mounting systems from other manufacturers if you choose.
Construction and Materials
The curious shape of the Fat Cat is due to its interesting blast chamber. The suppressor tapers at the breech end, making the blast baffle detached at its rear. This blast chamber design surely causes a great deal of turbulence as gas tries to escape from the Fat Cat.
Manufacturing the blast baffle from cobalt 6 was done to increase durability and reduce erosion of the suppressor. Cobalt 6 is an alloy including tungsten and chrome, its resistance to heat and erosion makes it ideal for the Fat Cats blast chamber.
The rest of the suppressors construction consists of 17-4 stainless. This high tensile strength alloy is also resistant to erosion, the entire suppressor is welded together for robust one-piece durability. The finish on the Fat Cat is black Cerakote, which is made to stand up to the heat and action of shooting.
These construction aspects of the Fat Cat are why YHM gives it a full-auto rating. Though it does come with a minimum barrel length requirement, which I suppose is fair. I don’t do a lot of full-auto shooting, so I didn’t expect it would be a huge concern.
Shooting the Yankee Hill Machine Fat Cat 5.56 suppressor
Putting the Fat Cat through testing with the rest of my 5.56 suppressors would give me a good idea of its performance qualities. You can read more about a direct comparison to other suppressors here.
Using the sRx muzzle device, I could attach the Fat Cat to most of my 5.56 carbines. But I also used the Phantom QD muzzle devices just because I could. It would also allow me to mount the Cat to rifles that used 5/8-24 threaded muzzles (still chambered in 5.56).
I chose to test the Fat Cat on a variety of host firearms, for various reasons. For example, a bolt action Savage model 12 .223 rifle would allow us hear the pure unfettered muzzle report from the suppressor. Various semi-auto rifles and carbines would allow us to see how back-pressure and other function were affected by the suppressor. For that I used a couple different AR15 type rifles I’d put together, and I also used my Desert Tech WLVRN 5.56 rifle. Five different host rifles would give us a good idea of how the Fat Cat does suppressing the noise.
Sound Suppression
I was very pleased with the sound suppression of the Fat Cat. On every 5.56 rifle I used it, the sound reduction was fantastic. I never felt the need to use hearing protection, though I probably should. Those around also mentioned that it was very pleasant shooting even without hearing protection.
Back-pressure
On the semi-auto rifles this suppressor was destined for, there is bound to be some backpressure. On my direct impingement rifles, there was a slight increase in bolt speed. As well as additional gas venting out of the ejection port. This is something I’m used to when shooting suppressed. Comparable cans like the YHM Turbo, SiCo Saker and Sandman K gave very similar results while being longer and I believe heavier as well.
When shooting the Fat Cat on my Desert Tech WLVRN this was less a problem as it uses an adjustable gas valve. This allows you to reduce the gas volume hitting the piston.
Compatibility
I really appreciated the compatibility of the Fat Cat. To be fair it is equalled by the other YHM suppressor family. The sRx QD system that comes with the Fat Cat is outstanding and compact. Additionally I used the Phantom QD mounting system, which seamlessly threaded on to the Fat Cat just as it did my Turbo T3 and Turbo K.
Using the industry standard 1.375 x 24 thread pattern also allow you to use whatever brand mounting system you wish. If you prefer one of the other manufacturer’s mounting system, you can simply spin it on to the back of the Fat Cat and roll.
YHM Fat Cat Pros and Cons
If you look at the YHM Fat Cat as simply a compact suppressor for your 5.56 carbine, then it is really hard for me to come up with anything I’d change. Its pretty light by comparison, its shorter than most 5.56 cans, its compatible with a plethora of mounting systems. There is just nothing to dislike about it. It brings all these features at a pretty moderate price of only $699.
The only way I think you might have issues with the Fat Cat is if you shoot high volumes of full auto. It is rated for such rates of fire, but your bound to get burnt and left penniless after burning up all your ammo.
Final Opinion
As with other 5.56 suppressors from YHM, I found myself tickled with with the Fat Cat. It was a perfect fit for my smaller rifles that I like to EDC. It added minimal length to the firearm, and yet it suppressed the report handily.
If I needed only one suppressor for all my .223/5.56 needs, I’m quite confident the Fat Cat would be more than enough. Whether it be on one of my .223 bolt guns, or the semi-autos you see here, the YHM Fat Cat is an easy choice for me. Give it a look if you too are broadening your suppressor inventory.