SIG Sauer Standalone P320 FCU

SIG Sauer

$299.99 - $349.99
(6 reviews) Write a Review
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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.

6 Reviews Hide Reviews Show Reviews

  • 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

  • 5
    Great company

    Posted by Anthony on Jul 8th 2022

    Super happy to find an FCU let alone one that’s not almost $400+ out the gate. Looks super good in stainless and black. That all being said I want to say customer service here is the best I’ve ever had. I had trouble ordering online and they not only emailed me multiple times with advice but it was also at 10pm on a Saturday night. Then they CALLED me that SUNDAY morning to respond to a message I left. I have nothing bad to say, If you’re on the Fence buy from here.

  • 5
    Sig standalone P320 FCU

    Posted by Dave on Mar 7th 2022

    Was just happy to find one that wasn't $50 less than a complete gun. Had all the other parts and was tired of switching my FCU in and out. Love the stainless and black look over the TiN Gold looking unit. So far so good. Thanks AB.