Rattler Sig Sauer - Most of you will probably understand when I say that I have a bucket list, but it's always "if I win the lottery." I have a few of those rifles on my list, but when I saw SIG Sauer's new MCX Rattler, I knew it was something new on the market and I was excited. I reviewed it at SHOT Show and the NRA Annual Meeting last year. I've always thought it was a useful system and was interested in getting it working again. Thankfully I found it and had the opportunity to buy it, so I did! Let's see what I think about it in a year.
First, the gun packs a big punch for such a small package. The overall length from the mouth to the end of the spoon is 16 inches. It is also chambered in 300 Dark with a 5.5 inch barrel. The rifle weighs more than 5 kilograms without optics. It's a tough little gun built like a tank, but not bad at all. I believe SIG always puts QD mounting points on all rifles and pistols. The pits made it really easy to drop in and run with it. I mounted my rifle on an Anvl Ukon mount with a Trijicon RMR.
Rattler Sig Sauer

The Anvl Ukon mount has a system of iron sights, so there is no need to store irons in the weapon. I thought the initial concept was weird, but after using it in a PDW system, I honestly don't think there is a better option on the market right now. I was originally interested in mounting this optic because there are special forces groups around the world that use the MCX Rattler with the Trijicon RMR on Mount Ucon. It's easy to see why they went with this setup! I shot the Surefire M300 Mini Scout at 5-point range and called it good.
Sig Sauer Mcx \
So far I have put 3700 rounds through the MCX Rattler and it has been 100% reliable. I average 1.5” groups at 100 yards. Not very impressive unless you consider it has a 5.5 inch barrel. The gun is an absolute blast to shoot and the recoil is very manageable. I was surprised at how easy it was to hold the target during practice or pass shooting, and even though it's a very small package, the pistol won't blow you away with a muzzleloader or a big shot. My gun came with SIG's triple flash suppressor and it does a good job of reducing muzzle blast.
When it comes to the MCX Rattler, there are a few things you need to get used to. First, I'm not a huge fan of the small charging handle on the gun. I fully understand that this is a PDW tool, so everything is designed to be streamlined and as low-profile as possible. The device's handle is very compact, making it perfect for popping out of a concealed carry bag. The downside to this is that the weapon is very difficult to use while reloading. I changed the magnet a few times on the range and at the end of the day my rag was out of business, but it's not a deal breaker.
I bought a Geissele Super X charging support for the Rattler and that solved the problem. The only thing I can see of the gun is the collapsible pistol. The browband was adjustable, which is a plus, but I preferred the side fold, which was easy to install. The retractable stock is really well built, but it takes two hands to deploy quickly. Only one hand is needed for quick installation of the cover. This is just my personal preference, but a very minor quibble with an otherwise fantastic tool. Both of these problems are easily overcome with the charging handle and SB Tactical side-folding holster.
When I first bought the MCX Rattler, I was worried that it wouldn't live up to my high expectations. After owning it, I'm happy to say I'm happy with it if it doesn't exceed my expectations. The gun just works and packs a lot of firepower into a small package. I can throw it in a single strap bag and carry the Rattler with no problem, otherwise it's not that heavy.
New From Sig Sauer: Mcx Rattler Canebrake
I will probably buy the new Vertx sling bag for the Rattler and post what I think about it. I am planning to travel in the next 6 months so that he can travel with me. I plan to update you on my experience with the Rattler, but after 1 year it has been fantastic. As always, feel free to email me if you have any questions or comments. Also, follow my Instagram account and as always, stay safe.
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I am a very good shooter and that would be a must in my business or the shooting community. I enjoy talking to other people about firearms and other interests. I knew that SIG was working on a new, compact version of the MCX. They have been refining this design for a while after hearing rumors about it overseas during DSEI two years ago. Later, when I asked about it, they showed me the development models. Everything is clear today. SIG SAUER presents the latest addition to the MCX family, the Rattler. I had a chance to talk briefly about the rifle with Patrick Hanley, rifle product manager at SIG.

The first question I asked him was about the name. I heard that it was floating around for a while, I don't know where it came from. Apparently, after shooting it on full auto for the first time, the designer said, "When you hit it with fire, it really bites." Given the MCX moniker, the Rattler stuck.
Sig Sauer Mcx Rattler Canebrake 300 Blk
Then I asked why they built it. Hanley replied, "Everything has to be as discrete and small as possible with this weapon." Simply put, customers came to them asking for a 5.56mm or .300 BLK machine gun. This is the result of the work.
At first they used the MCX short-stroke piston design, but quickly discovered that the upper part would be longer than the 5.5-inch barrel. Instead, they developed two separate gas systems, one for the .300 and the other for the 5.56.
The .300 gas system has two positions and can be compressed. 5.56 is a combined gas system to prevent valve corrosion. Unfortunately, it cannot be used with a suppressor; not at this length. However, switching between calibers is as simple as changing the scope.
The stock has all the controls so that it can be controlled and the gun itself can be fired when the stock is closed, so it's designed in a very compact package. Additionally, the Rattler's upper receiver does not have a forward assist and has a closed side for expendable cases.
Sig Sauer Mcx Rattler Pcb 5.56 Nato Ar Pistol
SIG may have created the world's smallest AR-style gun. It has a 16-inch folding and 23.5-inch stock extension.
Based on these differences, the Rattler comes with either a full pistol (with SPB) or an SBR. The receivers are not compatible with other MCX uppers, so SIG offers special Rattler Upper Receiver Kits that come with an AR adapter lower adapter. When the Rattler upper set is used with the adapter knob, the MCX lower or AR lower can be used. Barrel kits will be able to swap calibers for Rattlers owners so they don't have to buy a full URG.
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