6 SIG P320 X5 Legion Problems You Must Be Aware of

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I got my hands on the widely acclaimed SIG P320 X5 Legion. I took it to the field, let it rip, and was in for surprises.

I loaded up, geared up, and headed out. Little did I know, the experience would take an unexpected turn. A few snags with the SIG P320 X5 Legion emerged as I navigated the ups and downs. It felt like I was detective, uncovering these little mysteries one after another.

I am talking about recoil spring problems, slide locking, battery blowouts, tricky trigger pulls, outgassing, and grip issues. Yeah, quite a list, right?

Don’t worry; I’ve taken these problems apart, dissected them, and figured out some solutions for you.

Quick Table of SIG P320 X5 Legion Problems

Problems Solutions
Slide Locking Clean and lubricate P320 X5 before use; switch ammunition brand and grain.
Battery Blowing Out Contact SIG for assistance; even without a safety recall, their team is able to assist.
Trigger Pull Replace firing pin block; consider a professional trigger job or aftermarket trigger.
Outgassing Send P320 X5 back to SIG for professional rework of the chamber.
Recoil Spring Swap standard spring for a 1911 guide rod with a lighter spring; reach out to SIG for additional assistance.
Grip Issues Adjust grip size and placement; apply grip tape; ensure comfortable trigger reach; experiment with different backstraps.

Top 6 Sig P320 X5 Legion Problems & Solutions

1. Slide Locking

After firing roughly 500 rounds, a new problem reared with the Sig P320 X5: the slide refused to lock. 

Specifically, it wouldn’t lock back after I fired the final round, making it difficult to empty the magazine. It was as though the pistol was defying my attempts to control it.


I revisited a fundamental rule of firearm maintenance: always clean and lubricate before use. By ensuring the firearm was well-oiled, I saw a noticeable improvement. 

Furthermore, I switched my ammunition type to a different brand and grain. These changes combined seemed to resolve the slide-locking issue effectively.

2. Battery Blowing Out Issue

Here’s a scenario to consider. You’ve got the Sig P320 X5 in hand, you’re set to fire, and you pull the trigger. But instead of the anticipated discharge, you realize the slide is not fully forward. 

This resulted in what’s known as an out-of-battery discharge – a rather unsettling experience that could potentially cause damage.


Upon encountering this problem, my immediate course of action was to reach out to SIG. 

Even though a safety recall hadn’t been issued for this specific problem, their team was more than willing to assist and rectify the issue.

3. Trigger Pull Issue

Another hurdle I encountered during my tests was related to the P320 X5’s trigger pull. 

The firearm’s design includes a firing pin block, which, during operation, caused the trigger to reset slowly and sluggishly. 

This attribute was inconvenient and significantly hindered my overall shooting experience.


To overcome this obstacle, I explored multiple potential solutions. These included replacing the firing pin block, investing in a professional trigger job to reduce the force required for pull, or opting for an aftermarket trigger. 

Each of these interventions offered improvements and enhanced my experience with the firearm.

4. Outgassing Problems

While conducting field tests with the Sig P320 X5, another issue came to my attention – significant outgassing problems. This issue was particularly noticeable as the rear chamber, specifically its machined slot, seemed to contribute to a substantial fogging of my optic. 

It seemed that the ejection of gasses and powder residue from the spent ammunition was causing a build-up on my optic, diminishing my visibility and effectiveness.


To address this, I had to enlist professional assistance. 

I sent the firearm back to SIG, where their team was able to rework the problematic cut in the chamber. This intervention addressed and resolved the outgassing issue that was clouding my optics.

5. Recoil Spring Issue

During my hands-on testing of the Sig P320 X5, I grappled with a persistent issue: the recoil spring. 

It manifested in several frustrating ways. Bullets were failing to eject as they should, the slide was stubbornly resisting smooth cycling, and at times, the pistol simply wouldn’t go into battery, rendering it inoperable. 

All these issues pointed to one culprit – the recoil spring.


To resolve this issue, I experimented with swapping the standard spring for a 1911 guide rod fitted with a lighter spring. This strategy seemed to alleviate some of the issues but didn’t entirely eliminate them. 

In the end, I had to reach out to SIG directly. Their customer service team was swift to respond, and they were aware of this problem. After their intervention, the problem was effectively rectified.

6. Grip Issues

I also faced some challenges regarding the ergonomics of the P320 X5, particularly the grip. I found that the design and feel of the grip were causing discomfort, negatively impacting my overall shooting experience.


To alleviate these issues, I implemented several adjustments. These included fine-tuning the grip size and placement, applying grip tape for enhanced traction, ensuring the trigger reach was comfortable, and experimenting with different backstraps. 

These modifications proved fruitful, significantly improving my comfort level and the overall usability of the P320 X5 during my testing sessions.


When I look at the SIG P320 X5 Legion as a whole, it’s evident that this handgun is a complex piece of machinery. It’s a firearm that demands respect, understanding, and perhaps a bit of patience. 

I’ve run into a few speed bumps along the way during my field testing – from recoil spring troubles to outgassing issues to some ergonomics that didn’t quite hit the mark. 

However, what stands out is not just the challenges I encountered but the ways in which I was able to address them.

With diligent maintenance, some part replacements, and a little assistance from SIG’s customer service, I managed to turn these challenges into triumphs. 


Does the SIG P320 have issues? 

Yes, the SIG P320 has faced issues like malfunctioning, particularly firing when dropped, as reported since 2017.

What are the flaws of the SIG P320? 

The SIG P320 is always essentially cocked, with no external safeties to prevent unintentional discharges, making it vulnerable to malfunctions.

What is the Sig Sauer P320 controversy?

The Sig Sauer P320 controversy pertains to a lawsuit filed by 20 people claiming they were injured due to the handgun firing without a trigger pull.

Is Sig P320 good or bad? 

Despite its issues, the Sig P320 is largely considered a solid, comfortable handgun that performs well across various types of shooting.

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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.

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