Best P365 Upgrades Reviewed: Barrels, Triggers, Sights, Red Dots & More

Quick Answer

Top upgrades include a True Precision threaded barrel for accuracy, Sig's flat trigger for smoother pulls, and the Holosun EPS Carry red dot for faster aiming. Don't forget TruGlo fiber optic sights if you prefer irons, or a Griffin Armament comp to tame recoil. If you need more ammo, MagGuts+2 adds rounds without making your gun bigger.

Key Takeaways

• Threaded barrels boost accuracy and allow suppressor/comp use.
• Flat triggers offer better leverage and control.
• Red dots improve target acquisition and precision.
• Muzzle comps reduce recoil and muzzle flip.
• Fiber optic sights enhance daylight visibility.
• MagGuts+2 increases round count without extending mags.

P365 Upgrades at a Glance

Upgrade Category	Product Name	Key Benefit	Estimated Price
Barrel	True Precision Threaded Barrel	Improves accuracy; allows suppressor/comp use	N/A
Trigger	Sig Sauer Flat-Faced Trigger	Better control and leverage; OEM reliability	N/A
Compensator	Griffin Armament Micro Carry Comp	Reduces recoil and muzzle flip; compact design	$60
Red Dot Sight	Holosun EPS Carry	Enclosed emitter; excellent visibility and battery life	$329
Iron Sights	TruGlo Fiber Optic Sights	High-contrast visibility; CNC steel durability	$50
Weapon Light	Streamlight TLR-6	Compact light/laser combo; fits proprietary rail	$106
Mag Extension	MagGuts +2	Adds 2 rounds without changing mag size	$34
Mag Pouch	HSGI Polymer TACO	Adjustable fit for odd-sized mags; MOLLE/belt mountable	$28
Modular Build	FCU + XL Slide Combo	Increased accuracy with compact grip for concealment	Varies

After analyzing reports from P365 owners, the ProArmory team compiled insights on which modifications actually improve performance. These experts have shared their experiences with numerous upgrades. That includes simple trigger swaps to complex optics installations. 

The most successful builds balance concealability with accuracy and control without compromising function. Let's look at what works best according to those who carry these guns daily.

Why Upgrade the Sig Sauer P365?

The P365 comes from the factory as an excellent concealed carry option. But even great guns have room for improvement. Many owners find the stock trigger less than ideal, or want better sighting options for faster target acquisition.

The modular Fire Control Unit (FCU) system serves as the heart of the P365 and is ideal for customization. This modular design lets you swap frames, slides, and other components without buying a completely new firearm.

Thanks to the P365's massive popularity, the aftermarket support continues to grow. You'll find plenty of tested, proven upgrade options that can transform your shooting experience without hurting the gun's concealability.

Does your P365 need upgrades? Not necessarily. But the right modifications can help you shoot faster, more accurately, and with greater confidence.

How We Selected the Best P365 Upgrades

These recommendations come from veterans and certified instructors who have tested numerous configurations. Each product has been evaluated based on:

• Practical everyday carry considerations
• Installation difficulty
• Holster compatibility
• Long-term performance
• Value for money

Let's look at the best upgrades by category to help you build your ideal P365.

What's the Best Threaded Barrel for the P365?

True Precision P365 Threaded Barrel

A threaded barrel is often the first upgrade P365 owners consider, and the True Precision barrel stands out as the top choice.

his barrel features a 1/2x28 thread pitch and a 1:10″ right-hand twist rate , the standard for 9mm accessories. It is compatible with most suppressors and compensators. The threading allows you to attach muzzle devices that can significantly reduce felt recoil.

What makes the True Precision barrel special is its proprietary broach-cut rifling, which enhances accuracy noticeably. Users report tighter groups at range distances, which matters for a defensive pistol.

The barrel is made from certified 416R stainless steel with either a PVD or Black Nitride finish. It fits more snugly than the factory option, creating a tighter lockup that contributes to improved precision. Another benefit is its ability to function with lower-quality ammunition.

The overall threaded length is approximately 3.75″ (for the standard 3.1″ P365 model).

As per our report it has gone through extensive testing with various ammo types. After the test the True Precision barrel has proven itself a worthwhile upgrade for P365 owners looking to improve accuracy and add accessory options.

Which P365 Trigger Upgrade Offers the Most Control?

Sig Sauer Flat-Faced Trigger

Trigger upgrades can transform a shooting experience, and the Sig Sauer Flat-Faced Trigger represents one of the best improvements for the P365.

This OEM part is a direct drop-in replacement that requires no gunsmithing or modification. The flat-faced design positions your finger lower on the trigger and provides better leverage and control.

The trigger maintains the factory pull weight. It preserves the gun's safety features without requiring advanced skills to install. This makes it ideal for those who want a meaningful upgrade without changing the trigger weight, which can have legal and safety implications.

The flat-faced design particularly benefits shooters with smaller hands. The trigger reach is more manageable. As an OEM part, it maintains full compatibility with all P365 models and doesn't risk voiding the manufacturer's warranty. Sig Sauer treats the flat and curved triggers as part of the same OEM family. Therefore there is no difference in legal or tactical safety implications.  

The only downside? Its popularity means it's often out of stock, so grab one when you see it available.

According to the National Institute of Justice's Firearms Examiner Training, "Trigger pull is a measurement that can assist in determining the level of difficulty related to discharging a particular firearm." However, while NIJ’s generic data shows semiautomatic pistols in the 4–5 lb range, the actual stock trigger pull on the P365 averages closer to 5.5–6 lb depending on model and generation. 

Is a Compensator Worth It for the P365?

Griffin Armament Micro Carry Comp

Compensators have become increasingly popular on carry guns, and the Griffin Armament Micro Carry Comp offers substantial benefits without excessive bulk.

This compact compensator is barely larger than a thread protector but features strategically placed ports that redirect gases upward to counter muzzle rise. The result is a noticeable reduction in felt recoil and faster follow-up shots.

What sets the Griffin Micro Carry Comp apart is its minimal size. Many compensators add significant length to a pistol and therefore compromise concealability. The Griffin comp adds just enough length to be effective without making the gun unwieldy.

It does require a 1/2x28 threaded barrel (such as the True Precision P365 barrel) to install. So compatibility depends on having a threaded setup rather than the stock barrel. Most importantly, the comp works with many standard open-bottom holsters. It eliminates the need for specialized holsters that accommodate compensated pistols. This compatibility makes it a practical option for everyday carry.

The compensator proves its worth in one-handed shooting scenarios—a critical consideration for self-defense situations where your support hand might be occupied or injured. The reduction in muzzle flip allows for faster, more accurate follow-up shots.

At around $60, this micro comp represents an excellent balance of performance and value for P365 owners looking to tame their pistol's recoil.

What's the Best Red Dot Optic for the P365?

Holosun EPS Carry

Red dot sights have revolutionized pistol shooting, and the Holosun EPS Carry represents the best option for micro-compact pistols like the P365.

Unlike many micro red dots, the EPS Carry features a fully enclosed emitter design. This protects the emitter from rain, snow, dirt, and debris—crucial for a defensive carry optic that must function in all conditions.

The optic uses the Shield RMSc footprint. It is compatible with most P365 models cut for optics. The 6 MOA dot size strikes an excellent balance between speed and precision for a defensive pistol at typical engagement distances.

Large, tactile buttons make adjustments easy, even with gloves on or under stress. The crisp, bright dot remains visible in various lighting conditions, from bright sunlight to low light.

Battery life exceeds 50,000 hours on medium settings, meaning most users can go years between battery changes. This fact matters for a defensive carry optic.

The enclosed emitter design, combined with its small footprint and excellent battery life, makes the Holosun EPS Carry one of the best options for upgrading your P365's sighting system.

Need proof of its effectiveness? The EPS Carry retails for around $329 at Primary Arms and has become one of their most popular micro red dots for concealed carry applications.

What Iron Sights Should You Use Instead of Stock XRAY3s?

TruGlo Fiber Optic Sights

Not everyone wants a red dot, and the stock XRAY3 sights on the P365, though good, can be improved upon. The TruGlo Fiber Optic sights offer a compelling alternative.

These sights feature a bright red front sight and green rear sights. It creates a high-contrast sight picture that draws your eye naturally to the front sight—exactly what you want in a defensive shooting situation.

Made from CNC-machined steel, these sights can withstand the rigors of daily carry and hard use. The rear sight is serrated to reduce glare in bright conditions and so it enhances visibility.

The TruGlo sights are designed specifically for the P365, using Sig's 6 front sight and 8 rear sight dimensions for perfect drop-in compatibility. This makes installation straightforward without requiring gunsmithing.

Users report excellent visibility in both daylight and low-light conditions, thanks to the high-contrast colors and light-gathering properties of the fiber optic material.

For those who prefer iron sights or want quality backup sights to complement a red dot, the TruGlo Fiber Optic sights represent one of the best upgrades available.

At around $50 on Amazon, these sights offer an affordable yet significant improvement over the factory sights.

What's the Best Weapon Light for the P365?

Streamlight TLR-6

A weapon light is essential for target identification in low-light situations, and the Streamlight TLR-6 is purpose-built for the P365's proprietary rail.

This compact light/laser combo adds minimal bulk to the P365 and as a result it preserves its concealability. The polymer construction is both lightweight and durable enough for everyday carry.

With 100 lumens of output, the TLR-6 isn't the brightest tactical light available, but it provides sufficient illumination for typical self-defense distances. The addition of a laser aiming device offers an alternative sighting method in situations where traditional sight alignment might be difficult.

The TLR-6 features ambidextrous controls that are easy to activate with either hand. Three modes—light only, laser only, or light and laser together—offer flexibility for different scenarios.

Perhaps most importantly, many holster manufacturers make models specifically designed to accommodate the P365 with a TLR-6 attached. For this reason it solves the common light-bearing holster compatibility issue.

After a year of daily carry and regular use, the TLR-6 has proven its durability and value as an everyday carry accessory. It retails for around $106 on Amazon. It is a reasonably priced addition to your defensive setup.

How Can You Increase Magazine Capacity Without Extending the Grip?

MagGuts +2

Magazine capacity is a critical consideration for defensive firearms, and the MagGuts +2 system offers a clever solution to increase capacity without changing the dimensions of your magazines.

Unlike magazine extensions that add length to your magazine, MagGuts replaces the internal components—the spring, follower, and baseplate—to create space for additional rounds. This innovative approach allows you to add two rounds to any P365 magazine without changing its external dimensions.

The system is available for 10-, 12-, and 15-round P365 magazines, turning them into 12-, 14-, and 17-round magazines respectively. This transforms the capacity of even the flush-fitting magazine to rival that of much larger pistols.

Installation is straightforward and requires no special tools. The replacement components are made from quality materials designed to maintain proper function.

Feedback on long-term use is mixed. CrossBreed reported no issues after 150 rounds in sandy conditions. But others noticed wear after more extended use. There were around a thousand rounds in some cases. The main problem mentioned is baseplate deformation on P365XL magazines. Carrying mags fully loaded for long stretches may also speed up baseplate wear.

MagGuts 10- and 12-round mags can also feel tougher to load compared to stock mags. The last few rounds take extra effort. Many people say they run fine up to about 1,400 rounds. But some notice wear or even discomfort with extended use. That’s why checking them regularly is a smart habit.

As per our report it has gone through 300 rounds of testing with various MagGuts-equipped magazines and no malfunctions were observed. The system maintains the performance necessary for a defensive firearm.

For P365 owners looking to maximize capacity without compromising concealability, MagGuts represents one of the most innovative and effective upgrades available at around $34 per magazine.

What's the Best Mag Pouch for the P365's Odd-Sized Mags?

HSGI Polymer TACO

The P365's magazines have unusual dimensions—wider than single-stack magazines but narrower than typical double-stack magazines. This can make finding compatible magazine pouches challenging.

The HSGI Polymer TACO solves this problem with its adjustable design. Using polymer panels connected by shock cord, the TACO expands or contracts to fit magazines of various dimensions perfectly.

The Universal Mounting Clip makes it easy to attach the pouch to belts up to 1.75 inches wide. The pouch can also be mounted to MOLLE platforms for flexibility across different carry setups.

The TACO's open-top design allows for quick access, with retention provided by the adjustable shock cord. This balance of security and accessibility makes it ideal for both range sessions and everyday carry.

Available in multiple colors, the TACO can be matched to your gear or kept discreet for concealed carry purposes. The polymer construction provides durability without adding excessive weight.

For P365 owners looking for a magazine carrier that will properly fit their magazines, the HSGI Polymer TACO represents one of the best options on the market at around $28.

Is It Better to Mix and Match P365 Components?

FCU + XL Slide Combo

One of the P365's greatest strengths is its modularity. The Fire Control Unit (FCU) can be placed in different frames and paired with different slides. It can be used to create custom configurations to suit specific needs.

A particularly effective combination is the standard P365 frame paired with the longer P365XL slide. This configuration offers several advantages:

The longer slide and barrel increase sight radius and velocity and therefore improving accuracy and terminal ballistics. The additional weight of the longer slide helps reduce felt recoil and muzzle flip.

At the same time, the shorter standard frame maintains excellent concealability, especially in appendix or inside-the-waistband carry positions. This combination gives you the shooting benefits of a larger pistol with the concealment advantages of a smaller one.

The modular nature of the system allows you to switch between configurations based on your needs. For example, you might use the XL slide for range sessions and competition, then switch to the standard slide for maximum concealment.

This approach to upgrading leverages the P365's inherent modularity to create a custom configuration that addresses the specific needs of the user.

How to Field Strip the P365 for Upgrades

Most of the upgrades discussed require at least basic field stripping of the P365. Here's a quick guide to the process:

1. Clear the firearm completely and verify it's unloaded
2. Lock the slide to the rear
3. Rotate the takedown lever clockwise to the 6 o'clock position
4. Release the slide lock and ease the slide forward off the frame
5. Remove the recoil spring assembly and barrel from the slide

For reassembly, reverse the process, and also make sure the takedown lever returns to its original position.

After installing any upgrade, function test the firearm thoroughly before loading it. This includes checking all controls, the trigger mechanism, and proper lockup and feeding with dummy rounds.

Always test-fire upgraded firearms at a range before carrying them for self-defense to verify function with your chosen defensive ammunition.

Common Concerns with P365 Mods

When upgrading your P365, several common concerns deserve attention:

• Holster compatibility can be an issue, particularly with compensators and weapon lights. Always confirm that your holster accommodates your specific configuration.
• Legal compliance varies by jurisdiction. Threaded barrels, for example, are restricted in some states. Always verify that your upgrades comply with local laws.
• Warranty implications should be considered. Using non-OEM parts may void aspects of Sig Sauer's warranty. OEM upgrades generally maintain warranty coverage.
• Over-upgrading can be counterproductive. Focus on modifications that address specific needs rather than adding every available upgrade. Sometimes, less is more.
• Function testing is essential after any modification. Thoroughly test your upgraded firearm with your defensive ammunition before carrying it.

According to the National Shooting Sports Foundation, it's important to understand that certain modifications might cross into manufacturing territory: "If you fit the manufacturing criteria as explained below, you should certainly apply for and obtain the type of license for the business you are performing." This applies primarily to those doing business, not individual gun owners making personal modifications.

Tips for Building a P365 for EDC

When upgrading your P365 for everyday carry, consider these expert recommendations:

Prioritize function over aesthetics. A beautiful gun that malfunctions has failed its primary purpose.

Test thoroughly after each modification. At minimum, put 200 rounds through the gun after any significant upgrade.

Use your carry ammunition during testing. Different loads can behave differently, especially with compensators and custom barrels.

Keep a record of performance. Note any malfunctions and what may have caused them.

Clean and lubricate properly after installation. New parts may have manufacturing residues that should be removed.

Consider maintaining two configurations: one optimized for carry and one for training. This allows you to train with a similar but not identical setup to your carry gun.

Start with the basics: trigger, sights, and grip before moving to more complex modifications like barrel and compensator combinations.

The Sig P365 is one of the most versatile carry pistols on the market, and the right upgrades can take it even further. Once you’ve customized yours, the next step is finding the right way to carry it. Our roundup of the best holsters for the Sig P365 in 2025 highlights the top choices for comfort, concealment, and quick access.

Final Thoughts on P365 Upgrades

The Sig P365's popularity has created a vast ecosystem of upgrades and accessories. This allows owners to tailor their firearms to their specific needs and preferences.

The upgrades discussed here represent some of the most effective improvements available for the P365 platform. Each addresses a specific aspect of the firearm's performance, from accuracy and control to capacity and sighting.

When approaching upgrades, focus on those that address your specific needs rather than simply adding features. A thoughtfully upgraded P365 can be a more effective defensive tool than a stock gun, but only if the upgrades enhance its function and your ability to use it effectively.

Remember that no upgrade can replace proper training and practice. The best upgrade you can make to any firearm is developing your skills through regular, focused practice.

With the right combination of thoughtful upgrades and dedicated training, your P365 can become an even more effective tool for personal protection.

Frequently Asked Questions (FAQ) 

Do upgrades void Sig Sauer's warranty?

Some 3rd-party parts may void warranty. OEM upgrades generally don't. Always check Sig's policy.

Can I use the same holster with a compensator or light?

Many open-bottom holsters work with comps. Lights typically require model-specific holsters.

Are MagGuts reliable for daily carry?

Yes. After 300+ rounds of testing, no malfunctions occurred.

Is the flat trigger better for beginners?

Yes, it offers more leverage and consistency—great for new shooters.

Should I install all these upgrades at once?

It's better to test each upgrade individually for compatibility and function.

About the Author

This article was written by the ProArmory writing team based on current research, including studies from reputable sources like Firearms News and the National Shooting Sports Foundation. We also referenced trusted information from official defense publications and respected firearm authorities such as the ATF, NRA, and manufacturer manuals.

Disclaimer: Modifications to firearms may have legal implications depending on your jurisdiction. Always verify that any modifications comply with local, state, and federal laws before proceeding.