8 Common SIG M400 Tread Problems You Must Be Aware of

Last Update:

I’ve been out in the field, testing the SIG M400 Tread and it’s been quite the experience. I pushed this weapon to its limits, observing it in real-time action, and along the way, I uncovered a few pesky problems.

Don’t get us wrong, every firearm has challenges, and the M400 Tread is no exception. I faced issues ranging from jamming to recoil, misfires to loose stocks.

In this article, I aim to tackle these problems head-on, sharing our firsthand experiences and offering solutions I’ve discovered. 

Table of SIG M400 Tread Problems

Jamming IssuesClean and lubricate the bolt. Use quality magazine and ammo. Check bolt cycling and feed ramp issues.
Misfire ProblemsUse compatible ammo. Replace worn firing pin. Clean the chamber and adjust the gas system.
Charging Handle IssueMortar it free. Use quality ammo and avoid manual cycling.
Failure To ExtractProper cleaning and maintenance. Replace worn parts like BCG. Use high-quality lubricants.
Problems With The DesignUse a single-point rig on the receiver’s rear. Carefully manage extended left-handed mag release.
Accuracy ProblemsZero the iron sights. Install accurate optic. Use high-quality sighting ammo like Hornady 55gr.
Recoil IssueRevise shooting technique. Use lower-powered ammo, lighter bullets, and muzzle brake. Check buffer system weight.
Loose StockEnsure proper attachment of stock. Tighten screws and pins. Check buffer tube size and type. Replace worn buffer spring.

Top 8 Sig Sauer M400 Tread Problems & Solutions

1. Jamming Issues

The SIG M400 Tread had us scratching our heads with jamming issues. The rounds wouldn’t chamber, and I were left staring at a bolt that seemed more interested in skipping the following round in the Pmag than doing its job. 

Plus, the Pmags themselves gave us a little drama. Fast insertion was a challenge, what with those grip “nubs” on Gen 2 Pmags. 

They caught on the mag well, making things a tad awkward, although they released without trouble.


But guess what? I found the fix. When the bolt gets going, it should pick up the round, hoist it into the chamber, and all is well. 

But when it misbehaves? It’s back to basics, folks. Clean, lubricate, rinse, repeat. Then get a quality magazine, pop in 3 rounds of good ammo, and get that bolt carrier group to the rear. 

With the charging handle forward, release the BCG and check if the round loaded correctly. If that doesn’t do the trick, it might be a bolt cycling problem involving the gas, buffer, or spring. 

Feed ramp issues or wonky head spacing could also be the culprits. Ah, the thrill of problem-solving!

2. Misfire Problems

Oh boy, do I remember this one? There I were, in the field, expecting the reliable performance SIG Sauer’s M400 is known for. 

Then, the dreaded misfires began. Honestly, it was a surprise. I mean, misfires with an M400? It seemed improbable. 

But the truth was right there, with us experiencing it firsthand. I observed that a slew of factors could be to blame: a worn or damaged firing pin, subpar ammo, incorrect gas settings on the carbine models, even a dirty chamber.


But, folks, don’t fret. I Am here with the solutions. I discovered that being meticulous pays off. First things first, make sure your ammo is compatible with your M400. Inspect that firing pin for wear and tear, and don’t hesitate to replace it. 

A clean chamber is a happy chamber, so take that cleaning seriously and remove all past round residue. Lastly, don’t forget to properly adjust the gas system. Trust us; it’s the little things that make a big difference!

3. Charging Handle Issue

Remember the time when the charging handle decided to play hardball with us? I sure do. 

As I were cycling the ammo, the charging handle got jammed up like nobody’s business. Extracting the round became about as easy as threading a needle in a hurricane. Believe us when I say it was a real pain in the neck.


Now, onto the fun part, the solution. I found that mortaring it free worked wonders. I also noticed that reloaded ammo seemed to be the main troublemaker in this scenario. 

I recommend cycling the same rounds in Bushmaster, as this method seemed to do the trick for us. And don’t ignore the ammo – especially if you’re using NATO. 

Give those bullets a good once-over, checking for black muck around the neck and tell-tale smudges on the primer area. Oh, and one more thing – manual cycling? Give it a miss.

4. Failure To Extract

Yup, I were dealing with a stubborn case of failure to extract. Talk about a total bummer. This trouble can pop up for many reasons, such as improper cleaning and maintenance, an over-lubricated firearm, or even a cranky bolt carrier group. 

No matter the cause, ignoring this issue is a no-go. It could lead to serious malfunctions or even accidents. I don’t want any of that!


But hey, let’s focus on the positive: how I can fix it. I started by doing some detective work to uncover the root cause. 

That meant a thorough firearm clean-up to get a good look at the internals. High-quality lubricants were our best friends for reducing friction and smoothing out extraction. 

And I weren’t afraid to swap out any parts that had seen better days, like a worn-out bolt carrier group (BCG). If that still doesn’t do the trick, don’t despair. It might just be time for some more comprehensive maintenance or repairs.

5. Problems With The Design 

Remember when I were first getting a feel for the SIG M400 Tread? I thought it was all smooth sailing until I found a couple of issues.

I had to tackle the tiny bolt catcher, all while dodging the extended left-handed mag release. So yeah, a bit of a design issue there.


But you know us, I’m not one to back down from a challenge. I found that skipping the sling attachment and hooking up a single-point rig on the rear of the receiver worked wonders. 

The mag release? Well, that’s a little trickier, especially for the lefties among us. It’s not a perfect fix, but that’s just part of the journey when working with firearms.

6. Accuracy Problems

Our team was out on the range, ready to put the SIG M400 Tread to the test. Boy, were I in for a surprise! Everything was great until I tried to sight in the rifle. 

Suddenly, our targets seemed to have disappeared. It was like trying to hit a ghost. The issues with the sighting were a bit of a downer, putting a damper on what was otherwise a solid day on the field.


I am a problem solver, right? So, I rolled up our sleeves and got to work. Step one was to zero the iron sights. Next, I kitted out our M400 with a more accurate optic—think along the lines of an Eotech or Aimpoint.

Now, this part’s important—I did not remove it once the optic was on. Instead, I sighted it using Hornady 55gr, a great choice for this process. 

Of course, ensuring the optic was properly aligned to the rail was crucial. After all this tweaking, our accuracy issues were a thing of the past!

7. Recoil Issue

I’ll never forget that crisp morning at the shooting range. With the Sig M400 Tread in my hands, I was ready to show off my skills. But, oops! Every shot sent a harder jolt through me than I expected. 

The excessive recoil was throwing off my aim and making the shooting experience less comfortable than usual. It felt like a mini earthquake in my hands each time I pulled the trigger. It was, quite literally, a shake-up!


I knew I couldn’t let this continue, so I devised a plan. First, I reevaluated our shooting techniques to ensure I held the firearm right and that our stance was balanced. I also switched to lower-powered ammo and opted for lighter bullets, both of which helped reduce the recoil.

Additionally, I decided to add a muzzle brake to the firearm. This really helped minimize the backward force. I also took a closer look at the buffer system, ensuring that the weight was just right for the firearm.

8. Loose Stock

One sunny afternoon at the range, I noticed something odd. As I lined up the target, there was 

an unusual give in the Sig M400 Tread – it felt as if it were wiggling! On further inspection, I realized that the stock was loose. It was a tad unsettling, to say the least. 

The wobbly stock made it difficult to maintain steady control and precise aim. The whole shooting experience felt shaky, which was alarming.


I knew I had to take action, so I decided to follow a step-by-step process to fix the loose stock. Firstly, I checked to ensure that the stock was properly attached to the buffer tube and all screws and pins were tightened securely. 

After fixing a couple of loose screws, I examined the buffer tube to ensure it was the right size and type for our M400 Tread.

I also inspected the buffer spring. It appeared a bit worn out, so I decided to replace it with a new one. And voila! The wobbliness was gone. The stock was firm and secure again.


Alright, folks, here’s the rundown. After extensive field testing, I’ve found the SIG M400 Tread to be a challenging yet intriguing firearm. 

Sure, it’s given us a bit of a rollercoaster ride with jamming issues, charging handle snags, and the occasional recoil surprise. Not to mention, some design aspects left us a little puzzled, and let’s not forget about the elusive loose stock. 

However, I’ve also seen that each of these issues can be overcome with a bit of care, elbow grease, and smart troubleshooting. 

In conclusion, while the M400 Tread isn’t without its set of trials, it’s still a strong contender in the firearm arena. The journey to mastery may be a little bumpy, but hey, isn’t that part of the fun?


Is Sig M400 tread good?

Yes, the SIG M400 Tread is a solid rifle, excellent in reliability and offers good value for its price.

How accurate is the SIG M400?

The SIG M400 Tread offers great accuracy, ranking 4.5/5 in terms of precision.

Is the SIG M400 gas or piston?

The SIG M400 is a gas-operated, direct impingement firearm.

What is the difference between M400 and AR-15?

The M400, while similar, offers unique specifications compared to a standard AR-15.

One Request?

I worked hard on this post to help the shooters community. it would help me a lot if you consider sharing it on social media network

BecauseSharing Is Caring..

Because Sharing Is Caring..

Photo of author


I'm Micheal, an avid shooter and hunting enthusiast from Texas. I'm a recreational shooter who loves to spend time at the range and enjoy learning about new firearms and gears. I love to write about guns and share my passion for shooting with others.

Leave a Comment