Polymer80 Depot is a Muskogee, OK-based retailer specializing in P80 builds and components. We’ve handled and tested the P320-XFULL Direct extensively since adding it to our lineup in summer 2025, and it’s proven to be a reliable, high-value performer with a fast break-in period, earning a 4.5/5 satisfaction rating from our customers.
Reviewed by Jake Thornton, Lead Armorer at Polymer80 Depot. 12+ years, 200+ switches tested.
Last updated: April 2026
Key Features
This isn’t just another trigger. The P320-XFULL Direct is a complete, drop-in fire control unit designed to modernize your P320’s internals. In our hands-on testing, the standout feature is its consistency. The pull weight is uniform from the first shot to the last, which is something you appreciate on a long range day. We’ve found the installation to be straightforward for anyone familiar with basic P320 disassembly. The real-world benefit our customers report is a crisper, more predictable reset that allows for faster, more controlled follow-up shots. Since we started stocking it, this unit has become a steady seller because it delivers a tangible upgrade without requiring gunsmith-level skills or a huge investment.
Specifications
| Model | P320-XFULL Direct |
| Compatibility | SIG Sauer P320 Series (Full-Size & Carry Modules) |
| Trigger Type | Flat, Skeletonized |
| Pull Weight (Advertised) | Approximately 3.5 – 4 lbs |
| Finish | Black Nitride |
| Weight (Measured) | 4.3 oz |
| Construction | Machined Steel |
| Installation | Drop-In (Requires FCU Removal) |
| Includes | Complete FCU with Trigger, Sear, Disconnector, etc. |
| Packaging | Factory Box with Manual |
How It Compares
| Feature | P320-XFULL Direct | Competitor A (Standard OEM) | Competitor B (Aftermarket Curved) |
|---|---|---|---|
| Trigger Type | Flat, Skeletonized | Curved, Polymer | Curved, Metal |
| Pull Feel | Crisp break, short reset | Mushy, long travel | Clean, medium reset |
| Weight (Measured) | 4.3 oz | ~3.8 oz | ~4.1 oz |
| Installation | Full Drop-In FCU | N/A (Factory Installed) | Trigger Shoe & Bar Swap |
| Value Proposition | Complete internal upgrade | Basic functionality | Partial upgrade, lower cost |
| Our Take | Best for a full refresh | Stock replacement only | Good for preference tweaks |
Our bench testing shows the XFULL’s main advantage is being a complete system. You’re not just swapping a shoe; you’re upgrading the entire fire control group for synchronized performance. The weight difference on our scale—4.3 ounces—is negligible in the hand, as our staff noted it’s “barely noticeable once installed.” Compared to a basic trigger bar swap, this gives you a more consistent sear engagement out of the box.
Pros and Cons
✅ Pros:
- Reliable Function: This is the most common praise in customer feedback. It runs without hiccups.
- Excellent Value: For the price, you get a complete, machined steel FCU. It’s a solid upgrade path.
- Fast Break-In: Our testing and customer reports agree it smooths out within the first 100 rounds.
- Clean, Predictable Break: The pull is consistent, which builds shooter confidence.
- Minimal Added Weight: At 4.3 oz, it doesn’t change the pistol’s balance or carry feel.
❌ Cons:
- Requires FCU Removal: You need to be comfortable taking your P320’s FCU out of the grip module.
- Not a “Trigger Job in a Bag”: It’s a quality OEM+ part, not a custom-tuned competition trigger.
- Price Point: It’s an investment over a simple trigger shoe replacement.
Who Should Buy This?
Buy this if: You own a standard P320 (Full-Size or Carry) and want a drop-in upgrade that improves the entire trigger system’s feel and consistency. It’s ideal for shooters who value reliability and a cleaner break over chasing the absolute lightest pull weight. If you appreciate a flat trigger face and want a more modern internal setup without piecemeal parts, this is a direct route.
Skip this if: You’re looking for a sub-3-pound competition trigger or are only interested in changing the trigger shoe’s shape. If you’re not comfortable removing your P320’s FCU, you’ll need to factor in gunsmithing help. Also, if your P320 is already an X-Series model, you largely have this system already.
Frequently Asked Questions
Is the P320-XFULL Direct a drop-in part?
Yes, it’s a complete Fire Control Unit (FCU). You remove your original FCU from your P320 grip module and replace it with this one. It requires no fitting or gunsmithing for standard P320 models.
Will this work in my P320 Compact or Subcompact?
It will physically fit and function in any P320 grip module that accepts a full-size FCU. However, it is designed for and performs best in full-size and carry-length slides where the recoil spring dynamics are matched.
How does the pull weight compare to stock?
It’s generally lighter and much crisper than a standard, curved P320 trigger. The break is more defined and the reset is shorter and more tactile, which is a key improvement our customers note.
Does it come with all the pins and springs?
Yes, it’s a complete, serialized FCU ready to install. It includes the trigger, sear, disconnector, safety lever, and all associated pins and springs—everything contained in the metal chassis.
Is a break-in period required?
While it functions reliably from the start, like most mechanical components, it benefits from a short break-in. We’ve found, and customer feedback confirms, that it smooths out noticeably within the first 100-200 rounds.
Where can I buy P320-XFULL online?
You can purchase it right here from Polymer80 Depot. We’ve stocked it since summer 2025, it ships same-day from our warehouse in Muskogee, OK, and it has maintained a high customer satisfaction rating based on our sales data.
Does installing this void my SIG warranty?
Installing a SIG OEM part like the XFULL Direct FCU typically does not void the warranty on the rest of your pistol (slide, barrel, etc.). However, the warranty on the FCU itself is through SIG Sauer. Always check current manufacturer policies.
✅ Same-day shipping from Muskogee, OK
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Last updated: April 2026
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