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RealTruck

RealTruck BAK BAKFlip MX4 Hard Folding Truck Bed Tonneau Cover | 448131 | Fits 2019 - 2026 Chevy/GMC Silverado/Sierra, works w/ MultiPro/Flex tailgate 6' 7" Bed (79.4")

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Returnable until Jan 31, 2026

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Availability: Only 3 left in stock, order soon!
Fulfilled by Western Wild Motors
Arrives Monday, Mar 16
Order within 19 hours and 46 minutes
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Style: BAKFlip MX4


Size: 6' 7" Bed


Features

  • Fits 2019 - 2026 Chevy/GMC Silverado/Sierra, works w/ MultiPro/Flex tailgate 6' 7" Bed (79.4")
  • THE BEST-SELLING TRUCK BED COVER IN THE WORLD JUST GOT BETTER
  • NOW EVEN MORE SECURE THAN GEN 2 | The new BAKFlip MX4 comes with an updated design tested to keep your gear on theft-resistant lockdown with a patented and upgraded auto-latch locking system.
  • FITS TIGHTER TO KEEP WATER OUT | Improved seals and all-new tight-fit clamps provide state-of-the-art weather protection.
  • PROVEN FOR EXTREMES FROM ALASKA TO FLORIDA | Tested in the harshest conditionsfrom -40 to 180F and zero to 95% humidityand guaranteed by a 5-year warranty.
  • NO WASTED BED SPACE, PARKED OR DRIVING | 100% bed access. All the time. Simply fold to the cab, easily secure, and safely drive with the cover fully open.

Description

America’s best-selling truck bed cover just got even better.Introducing the BAKFlip MX4 Gen 3—the latest evolution of RealTruck’s most popular tonneau cover. Now better than ever, the BAK has redesigned the for improved strength, security, and all-weather performance. The Gen 3 MX4 features alloy-based construction, including heavy-duty aluminum side rails and top panels, reinforced with high-density polymer cores. This updated design delivers a 22 percent increase in strength over the previous generation, making it even more capable of handling daily use, heavy loads, and harsh environments. Security has also been upgraded. BAK’s patented auto-latching system secures the cover automatically when closed. Newly engineered lock components provide added resistance to tampering and forced entry, allowing you to transport your gear with confidence. In rough weather, the Gen 3 MX4 holds strong. Revised EPDM perimeter seals and tight-fit clamps offer the best seal yet, helping prevent water intrusion along the bed rails. A longer dual-action tailgate seal weatherproofs the tailgate while preserving full functionality, whether the cover is open or closed. While the MX4 is built tough, it doesn’t compromise on looks. The flush-mount design gives it a sleek, low-profile appearance, while a textured matte-black finish across all surfaces delivers a clean, subtle aesthetic. Installation is easier than ever with a new click-in rail system that cuts install time by up to 12 percent. Day-to-day use is just as simple—drop the tailgate, unlatch, and fold the cover forward. For complete bed access, fold the cover against the cab without blocking your third brake light. The BAKFlip MX4 Gen 3 is proudly assembled in Missouri using globally sourced materials and backed by a 5-year warranty.

Brand: RealTruck


Style: BAKFlip MX4


Exterior Finish: Aluminum


Material: Aluminum


Lock Type: Latch


Brand: ‎RealTruck


Style: ‎BAKFlip MX4


Exterior Finish: ‎Aluminum


Material: ‎Aluminum


Lock Type: ‎Latch


Manufacturer: ‎BAK


UPC: ‎192631020486


Automotive Fit Type: ‎Vehicle Specific Fit


Global Trade Identification Number: ‎86


Model: ‎448131


Item Weight: ‎71 pounds


Product Dimensions: ‎81 x 9 x 23 inches


Item model number: ‎448131


Is Discontinued By Manufacturer: ‎No


Manufacturer Part Number: ‎448131


Date First Available: August 23, 2018


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Mar 16

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • BAK Revolver X4ts on my 2024 GMC Sierra
Style: Revolver X4ts Size: 5' 10" Bed
This is for the BAK Revolver X4ts. Installed in my 2024 GMC Sierra short bed, it has a clean appearance and really like the way it looks, locks, and rolls up so as not to take up bed space by NOT requiring an in-bed storage canister. Rolling the cover back and forth is easily done with one hand. Installed fairly easily by myself. Has rubber seals all-around making it reasonably water-tight, but not 100% waterproof - but more than enough for my use. Cover is pretty tough as uses sturdy aluminum slats underneath the fabric overlay. I live in the desert, so will see how well the fabric holds up to sun. But am very happy with it so far. ... show more
Reviewed in the United States on August 29, 2025 by PM
    • Built to last and elevates your trucks appearance
Style: BAKFlip G2 Size: 5' 10" Bed
Easy to install takes about an hour. These covers look awesome perform great and ate worth every penny I have them on 3 of my silverados and never regretted purchasing them. Take your truck to the next level, I knw the upfront cost is a bit pricey but It will definitely be the last tonneau cover you buy because its built to last ... show more
Reviewed in the United States on October 11, 2025 by Pistol Pete
    • Just a great cover
Style: BAKFlip MX4 Size: 6' 7" Bed
this is the second one I have purchased and it is just a great cover. secure EZ to use and EZ to install
Reviewed in the United States on August 27, 2025 by Gary D.
    • Great Cover but minor issue with latches
Style: BAKFlip F1 Size: 5' 10" Bed
Good cover and Installation was easy. My only complaint is I would like to see the locking / latching mechanism upgraded. The cover has some room to not always line up perfectly with the mounting rails. The Rear has to be checked to see if both sides click into place. Often times one side needs help. Pulling the cover back towards the rear helps out. It does float a bit. Other than that it's a good design and the side rails fit perfectly on my new truck. 4.5 stars. ... show more
Reviewed in the United States on June 16, 2025 by John Paul
    • Update
Style: Revolver X4s Size: 6' 7" Bed
Review Image by Crnbred Crnbred
Review Image by Crnbred Crnbred
RealTruck BAK Revolver X4s Hard Rolling Truck Bed Tonneau Cover | 80131 | Fits 2019-2024 Chev Update June 2024 the original one was defective but i got a replacement because it was under warranty. After just over a year.. the canvas is peeling away from slats. . This is really a bad , bad Hard roller. DO NOT buy Updated review July 2022 Dropped this thing 2 stars. After just over a year the cover/ coating is starting to crack on the next the last slat..pics included. The slat is also raised now instead of laying flat. It is still functioning as normal so only dropped 2 stars for the cosmetic defects. At this price I cannot recommend this product if it is going to have these kinds of issues this early into its life. I guess it can't handle the heat of southern summers. A buddy of mine bought a truck and i specifically told him to stay away from this brand. Buy a hard roller from a less expensive brand. The extra money for this thing does not translate to better quality or endurance. Original review April 2021 Mine came with 1 rubber stopper missing and 1 of the black screw downs was stripped. I have a 2019 Silverado 6.5ft bed. I have a spray in liner. I had to install 3 times because each of the rubber gaskets they gave for the bulkhead made the cover stand to high. The 3rd Install I just chose not to use ether of the gaskets.. still pretty water tight at bulkhead. Some water leaks in at the corners of the tailgate. This cover costs a pretty penny but imo is the best option. Gives you the best combination of accessibility, security, easy of use, and low profile as any. It is a bit heavy but light enough to where I could roll it up , remove it, and install it by myself if I needed to. ... show more
Reviewed in the United States on May 13, 2021 by Crnbred Crnbred
    • Quick and easy
Style: Revolver X4ts Size: 5' 10" Bed
Review Image by Brennan Schrade Brennan Schrade
So far so good. Installation was super easy. (Wish the QR code actually opened the installation docs instead of just porting you to the site to search for it, but oh well). Installed it solo. Took about an hour because I went slow to make sure I got it right the first time. All in one box and packaged well. Looks good so far! ... show more
Reviewed in the United States on July 19, 2025 by Brennan Schrade Brennan Schrade
    • Love it, perfect fit
Style: BAKFlip MX4 Size: 5' 10" Bed
Review Image by James H. James H.
Had a little trouble lining up where to secure it on the bed as all but two holes already present were not in the same spot where I drilled through the carbon pro bed rails, oops, read all the instructions first not just the first few pages so you don’t make the same mistake, this one is on me. Once I corrected it, the cover fit snug like it is supposed to. Great quality and looks awesome. Right after I secure camping equipment, out of sight, out of mind. Love the cover. ... show more
Reviewed in the United States on September 14, 2023 by James H. James H.
    • Disappointed in the performance of the gasket seals.
Style: BAKFlip MX4 Size: 6' 7" Bed
Review Image by Kevin Kevin
Review Image by Kevin Kevin
Review Image by Kevin Kevin
The rubber gaskets that run down the top outer edge don't hold up well. I have only had this for less tan three months and the gaskets are failing at the seam where the sections fold over.
Reviewed in the United States on August 2, 2025 by Kevin Kevin

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