SIG Sauer Standalone P320 FCU

SIG Sauer

$299.99 - $349.99
(11 reviews) Write a Review
LIMIT 2 PER DAY, See Additional Options Below
Calculated at Checkout
Selected FCU Finish, Trigger Finish is
Adding to cart… The item has been added


Here is SIG's OEM Standalone P320 complete FCU with all Factory SIG FCU parts and the skeletonized flat trigger.  Includes the flat, skeletonized trigger from the X5 Legion model, plus various FCU and trigger finishes available. The FCU will work with most P320 9mm, 40SW or 357SIG (not 45ACP or manual safety versions). ALL FCU PARTS are post-upgrade with the new drop parts. Will not work with pre-upgrade slide. Features custom "FCUXXXXXX" serial number (GOLD FCU ONLY, STAINLESS OR BLUE FCUS HAVE STANDARD SEQUENTIAL SERIAL NUMBER).

Includes: Factory SIG Sauer serialized FCU, all SIG FCU parts assembled in FCU with skeletonized flat trigger, extended X-Series slide catch and takedown lever. Pistol shown for reference only. Stainless or Blue FCUs do not include any factory packaging. Assembly grease, oil, etc. may be present. All parts are NEW. NOT ALL OPTIONS MAY BE IMMEDIATELY AVAILABLE. PLEASE NOTE: ONLY THE GOLD FCUs CAN BE REGISTERED WITH SIG SAUER. STAINLESS AND BLUE FCUs ARE BUILT FROM EXISTING PISTOL FCUs (ALL NEW SIG OEM PARTS).

OPTIONAL (checkbox): Add manual safety conversion to add the SIG factory manual safety lever. See details HERE.

Barrel, Slide, Optic, Grip, Magazines, Chamber flag, etc. are NOT INCLUDED.

FFL is REQUIRED for transfer of frame. Serialized frame not available in CA unless Law Enforcement. Federal law requires that the purchaser must be 21 years of age or older to transfer a serialized frame.

For quickest shipping please have your FFL send their license to our email: We will only ship to the FFL address.

11 Reviews Hide Reviews Show Reviews

  • 5
    P320 FCU

    Posted by John on Feb 28th 2023

    Excellent product, lightening fast shipping!

  • 5
    FCU with manual safety

    Posted by LC on Feb 22nd 2023

    Great work on adapting the FCU for a manual safety. Done at a reasonable price, similar to buying an FCU and adding the safety yourself, and delivered timely. Very satisfied with purchase.

  • 5
    Nicely done!

    Posted by Rol on Feb 10th 2023

    Nicely done! It was definitely worth the wait. I have got to believe you will be getting more business re these conversions.

  • 5
    Love the skeleton black trigger

    Posted by Rich Vasquez on Dec 26th 2022

    Quick deliver

  • 5
    P320 FCU Stainless

    Posted by Steven Casarez on Dec 14th 2022

    I purchased the stainless/black FCU to better match the parts I am using and couldn’t be happier with the parts quality and overall purchase experience. The trigger is excellent and was shipped out very fast. Highly recommended for those people looking for another color than TiN. Great company to do business with!

  • 5
    Sig P320 FCU

    Posted by Benjamin Garcia on Dec 1st 2022

    Thank you for the fast service and product . I would absolutely do business with you all again

  • 5
    Great product, works perfectly

    Posted by William on Sep 8th 2022

    Order or pick up from AB Prototype! The owner is a super nice guy and laid back, he got the order shipped to an FFL the day I ordered it. Not much to say about the product, its a standard FCU that drops into a p320 module.

  • 5
    Fast shipping

    Posted by Bill Frame on Aug 30th 2022

    Product exactly as described!! Extremely fast shipping!! Will look forward to being a future customer of AB Prototype!!

  • 5

    Posted by Sid on Jul 26th 2022

    2nd FCU and Wilson Combat frame purchase. Best products for any SIG pistol build