Sig Sauer P365 FCU - Fire Control Unit - Multiple Colors
or 4 interest-free payments of $87.50 with 
This item is regulated, therefore your entire order will be shipped to an FFL dealer of your choosing. After you place your order, we will contact you to finalize these details.
6 Magazines Per Order: Due to extreme volume, we are limiting sales of magazines to 6 per customer order. This applies to individual and bundled magazines. AT3 reserves the right to cancel any order over the 6 magazine limit.
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- Backed by the Sig Sauer Warranty! what it covers
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Product description
Build Your Dream Carry – The Sig Sauer P365 FCU
This exclusive fire control unit from Sig Custom Works is the foundation for your dream everyday carry pistol. The serialized trigger group is compatible with all P365 9mm components. Just add your choice of grip module, slide, barrel, magazines, and more to fully customize performance and aesthetics.
This FCU features a polished titanium nitride-coated frame and matching smooth flat trigger for a clean break. Tungsten-infused internals resist wear and ensure reliable function.
Available only through Sig Sauer, the P365 FCU lets you construct a one-of-a-kind concealed carry piece tailored specifically for your needs. Just start with the ultimate base that is this Custom Works engineering masterpiece. Build the micro-compact 9mm pistol of your dreams starting with the P365 fire control unit from Sig Custom Works.
Specification
- Brand: Sig Sauer
- Model: P365 FCU
- MPN: 8900165
- Compatible Calibers: 9mm, .380 Auto
- Trigger: Flat Titanium Nitride
- Color: Black or Gold
All 2 options on this page
- Sig Sauer P365 FCU - Fire Control Unit - Multiple Colors - Color: Black SKU SG8900165 · UPC 798681626007
- Sig Sauer P365 FCU - Fire Control Unit - Multiple Colors - Color: Gold SKU 8900164 · UPC 798681659548
Customer reviews 3
Verified buyer AT3 Tactical · Thank you for your feedback on the Sig Sauer P365 FCU! We're delighted to hear that you had a smooth experience with our product. We strive for perfection and we're glad we were able to deliver that for you. Happy shooting!
Questions & Answers 2
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What is the trigger pull poundage for the 365 FCU?
Perry Oates · Mar 7, 2026AT3 Support Team — The Sig Sauer P365 FCU has a factory trigger pull weight of 5.5 to 6.5 pounds. This striker-fired spec is consistent across P365 modules, delivering a short, crisp reset suitable for defensive builds with any compatible grip/slide—no variations by colorway.
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does the p365 FCU come with the manual safety kit, or do I need to purchase that separably?
Gregory Evantash · Feb 5, 2025AT3 Support Team — Thanks for reaching out No it does not come with a manual safety kit
Warranty & returns
Backed by the Sig Sauer Warranty!
Sig Sauer Warranty
Can I return the product that I received?
Eligible product may be returned in original packaging for a credit or refund of the purchase price within 14 days of purchase or shipment of Product to Buyer, whichever is later, less shipping and handling. In order to return a product purchased over the internet, or via the phone or facsimile, the Buyer must call Customer Service at 603-610-3000, option 1 during business hours (Monday through Friday 8:30 am to 5:00 pm), and request a Return Authorization Number (RMA). An RMA is required to return the Product. Customers who exchange products that are found to be defective will receive a credit for original shipping charges.
You may exchange the product or receive a refund in the original form of payment. Merchandise must be returned in original packaging and in new sellable condition.
Please allow up to 10 days after the return is received and inspected for the refund to be processed.
Electro Optics – New, unopened optics that still have the holographic seal can be returned for a refund/exchange with 14 days of purchase or shipment of Product to Buyer, whichever is later, less shipping and handling.
Products that cannot be returned at any time include, but are not limited to: firearms, ammunition, ammunition components, airguns, CO2, clothing that has been washed or shows signs of wear, opened consumable items and cleaning kits, opened DVD, CD or other copyrighted software or material, items that have been damaged, used, are missing packaging or accessories, or are otherwise not in new sellable condition. Seller reserves the right to refuse any return or exchange.
If you return a Product that qualified you for a discount, promotional item, or promotional card and either (i) do not also return the discounted or promotional item or (ii) have already redeemed the promotional card, Seller may deduct the value of the discount, promotional item or redeemed card from any refund you receive for the return of the Product.
Please call SIG SAUER Customer service at 603-610-3000, option 1 to receive a Return Material Authorization number. Our Customer Service hours of operation are:
Monday – Friday: 8:30 AM-5:00 PM Eastern time
