F4-15 AMBI Builder Set

Rated 5.00 out of 5 based on 4 customer ratings
(4 customer reviews)



The F4-15 Builder Set provides a solution for the DIY community; those that want to build themselves or take their time selecting components and just want the foundation of a precision rifle build.  We provide the F4-15 Receiver Set and rail system.

When checking out provide Cerakote color in the ORDER NOTES or call/email your instructions for more complicated Cerakote finishes.

Lead time: 1-2 weeks for Cerakote.



SKU: F4-15-BS-1 Category:

Product Description

Technical Specs

  • Material: Precision CNC Aerospace Aluminum Matched Billet Set 7075-T6
  • Adaptive Rail System (9, 10.1, 13.6, and 15.8 inches) or Adaptive Rail System – Lite (13.6 and 15.8 inches)
  • Finish: Anodized




Additional information

Weight 4.5 lbs
Dimensions 18 x 12 x 6 in
Handguard Length

10.1 Inches, 13.6 Inches, 13.6 Inches ARS-Lite, 15.8 Inches, 15.8 Inches ARS-Lite, 9 Inches

4 reviews for F4-15 AMBI Builder Set

  1. Rated 5 out of 5


    I was hesitant on placing my order originally, but Dave’s immediate correspondence as well as product/industry knowledge made me extremely confident in my purchase. His quality control and attention to details is unmatched. F4 has been extremely helpful and addressed all my concerns.

  2. Rated 5 out of 5

    joshua harrison (verified owner)

    Great Service throughout process. The set I received had excellent fit and finish. i was very pleased with the purchase

  3. Rated 5 out of 5

    Dave Fein

    Couldnt be happier finish and fit was fantastic and very affordable to get cerakote finish of choice. and ambi features is an added bonus

  4. Rated 5 out of 5

    alindo32 (verified owner)

    I normally only purchase from well known brands with a lot of reviews. I was a bit nervous giving this company a try with so little info to go off of. I am so glad I did! The set is beautifully finished and very well machined. I payed extra for the battleworn Cerakote to color match the Magpul OD green and they did a beautiful job. As much as I love this set, I was even more pleased / impressed with the customer service. They have been quick to respond to every email and even took the time to patiently help me over the phone with troubleshooting a mistake I made with the assembly. I would recommend and buy again. Great job, F4 team! Thanks again for the help and extra set screws, Dave.

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