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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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Availability: 16 left in stock
Fulfilled by dirtandthrottle
Arrives Sep 10 – Sep 11
Order within 9 hours and 18 minutes
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Style: MX4: America’s Top Seller


Size: 6' 7" Bed


Configuration: 2019 - 2022 New Body Style


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: MX4 America’s Top Seller


Exterior Finish: Aluminum


Material: Aluminum


Lock Type: Tailgate


Brand Name: RealTruck


Manufacturer Part Number: 448131


Unit Count: 1 Count


Manufacturer: BAK


UPC: 192631020486


Automotive Fit Type: Vehicle Specific Fit


Number of Items: 1


OEM Equivalent Part Number: 448131


Global Trade Identification Number: 86


Included Components: Tonneau cover^rails^hardware^installation guide


Item Type Name: BAKFlip MX4 Hard Folding Truck Bed Tonneau Cover | 448131 | fits 2019 GM Silverado, Sierra 6' 6" bed


Item Weight: 71 pounds


Model Number: 448131


Manufacturer Warranty Description: Extended 5 Year Warranty


Material Type: Aluminum


Lock Type: Tailgate


Style Name: MX4 America’s Top Seller


Exterior Finish: Aluminum


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sep 10 – Sep 11

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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Similar Products

Top Amazon Reviews

    • Great quality cover, seals very well, factory installation video is not 100% accurate
Style: MX4: America’s Top Seller Size: 5' 10" Bed Configuration: 2019 - 2022 New Body Style
I bought mine from Amazon and it had been opened previously and someone took many of the parts from the hardware kit, and no instructions. RealTruck sent me a replacement hardware kit, which had a few things I did not need, and no instructions. The RealTruck video for installing in a late model GMC or Chevy was quite helpful, but it makes a point of snapping the clamps into the side rails for assembly, that just can't be done with the side rails I received, I wasted some time trying. It took me over 2 hours to install thanks to the lack of instructions. I did it carefully and spent a lot of time on the final alignment. It fits and operates well, looks great, and I drove it in a howling rainstorm yesterday for about 20 minutes. No visible water inside the bed. So, a great product for my 2026 Silverado 1500. ... show more
Reviewed in the United States on June 12, 2026 by jackm8080
    • Factory Fit, Premium Quality, and Exceptionally Well-Packaged
Style: MX4: America’s Top Seller Size: 5' 10" Bed Configuration: 2019 - 2022 New Body Style
I recently installed a BAKFlip tonneau cover on my new Silverado High Country, and I couldn’t be more impressed. I was also really impressed with how well it was packaged — everything arrived protected, organized, and in perfect condition, which immediately gave me confidence in the product. The build quality is excellent — solid, well-engineered, and it fits the truck perfectly like it came from the factory. Installation was straightforward and took me less than an hour with basic tools. Everything lined up exactly as it should, and the instructions were clear. What I like most is how practical it makes the truck. Coming from an SUV, I was concerned about losing enclosed storage, but this cover completely solves that. It’s secure, keeps everything dry, and still gives me full access to the bed when I need it. It also looks great — low profile and clean, it really complements the High Country trim. Overall, this is one of the best upgrades I’ve made. ... show more
Reviewed in the United States on March 21, 2026 by JBL
    • Great Product
Style: MX4: America’s Top Seller Size: 5' 10" Bed Configuration: 2019 - 2022 New Body Style
Installation was a bit trickier than I expected & had some nuances that aren’t immediately obvious in the instruction video. Overall tremendous product, couldn’t be happier with the quality, value, function, fit, & look.
Reviewed in the United States on July 9, 2026 by Michael Rowbotham
    • Smooth install and quality product for my 2023 Silverado
Style: MX4: America’s Top Seller Size: 5' 10" Bed Configuration: 2019 - 2022 New Body Style
First, I spent a fair amount of time doing research for a decent tonneau cover. When I purchased my truck, I knew I needed a tonneau cover. I initially was leaning toward a retractable-style cover for a couple of reasons. One - I wanted something that would make my bed both secure and dry. Two - I wanted something that would be out of the way when I needed the full bed and was electric actuated. Third - I was fairly certain I wanted something constructed of metal rather than plastic or vinyl. There was one issue with electric retractable tops is they are VERY expensive! So, eventually I had arrived at the conclusion I just didn't want to spend the money for a retractable top, but wanted the sturdiness of a metal retractable top. BakFlip hits 2 of my 3 asks for a tonneau cover - AND at a fraction of the cost! So, this is MY comparison contrast between retractable vs folding tonneau covers. Next, when it arrived, it was packed very securely. I was a bit worried after I had ordered because I had read some reviews that indicated their cover was damaged during shipping. The box was large and bulky, but wasn't unmanageable. My 17 year old daughter actually got it into the house just fine on her own. Installation. My advice on installation is to unwrap the cover and brackets and separate the hardware into piles (nuts, washers, lock washers). The other reviews on here are spot-on! If you are like me and you're a garage 'tinkerer' with cars and trucks and know your way around a toolbox, you will have no problem with the install. It took me about an hour. Just be sure, to pay attention to the alignment and insure the brackets are grabbing your bed rails squarely. Definitely worth going back around to give the bolts a final 'snug' when you're done. Performance. I saw mixed reviews on here that were indicative of the cover leaking. The cover (so far) has kept the gear in my bed dry during the handful of rainstorms we've had since the install. As for the dust? Here's the thing. When you put one of these covers on, you are sealing around the top of your bed. The penetrations and voids UNDER that cover will allow dust (and in most cases water). How is it the tonneau cover's fault? Get creative if you want your bed to be air-tight. Overall, I am pleased with this purchase. In the end I am happy that I decided to save about $1600 because, as it turns out, I don't think having a remote and being able to click a button to retract the cover is worth an extra $1600. I hope this review helps if you are on the fence like I was... ... show more
Reviewed in the United States on June 21, 2023 by Bryce P.
    • Poor quality control, but looks good overall
Style: MX4: America’s Top Seller Size: 5' 10" Bed Configuration: 2019 - 2022 New Body Style
Review Image by Jeff
Review Image by Jeff
Review Image by Jeff
Review Image by Jeff
I was excited to receive my tonneau for my brand new truck, until I received it. The quality control issues that others report, seem to be accurate and consistent. I had several issues I encountered from the first piece I removed from the package, and others as I continued the install. Some were relatively minor but sloppy work, to others that will likely be permanent problems so I'm forced to call the manufacturer to request replacement parts. Problems include the rubber seals on the rails being misaligned lengthwise as well as off to the side on one of them. On the cover itself there was a piece not even remotely close to being in place and possibly damage to either the piece or the rubber seal attached to it. On one side of the cover itself the corner was bent and after loosening and trying to put back to the appropriate angle, its clearly not going to be sealed properly and looks bad. Beyond the quality control issues, the cover generally looks great. It is far from a water tight seal on my 2020 GMC AT4 short bed, visibly seeing gaps at the front and back of the truck bed. I expect that if left in the rain, water will enter and ruin anything stored inside if near the sides at least. Despite the sprayed on Berliner, I may go back and try to fit the seal at the front of the bed in hopes it fills the gaps seen there at least. The instructions only mention drop in bedliners, not the factory sprayed on textured liner so its unclear what the recommended path would be. Sadly I don't see a good fix for the tailgate gap that exists, perhaps if the seal at front works well I can try sliding the cover back a bit more? These are not problems I expected to have to solve myself and will prevent me from recommending this brand to others despite how good it looks. ... show more
Reviewed in the United States on November 2, 2020 by Jeff
    • Hopefully the new rails solve the problem.
Style: MX4: America’s Top Seller Size: 5' 10" Bed Configuration: 2019 - 2022 New Body Style
This product is really simple to put on. Looks great and it would be great if it didn’t leak. send first rain the rails leaked. See video. Sent a video to backflip. She immediately says oh will ship you out new rails cause those are defective. She said they would ship owner before May 1 and it is May 5 and they still haven’t shipped. Had to call and the day I called it was miraculous that a shipping label was generated, but they still haven’t shipped. ... show more
Reviewed in the United States on May 5, 2026 by Bruce
    • Expensive with some broken parts.
Style: MX4: America’s Top Seller Size: 5' 10" Bed Configuration: 2019 - 2022 New Body Style
The product is good, it arrived with the strap piece broken, the holes for the strap attach was full of burrs, all of them flown on my truck, the video instructions is not so easy to follow. It would be great if you don’t have to guess how can you install it.
Reviewed in the United States on May 15, 2026 by xochitl
    • Bakflip bed cover installed
Style: MX4: America’s Top Seller Size: 5' 10" Bed Configuration: 2019 - 2022 New Body Style
Review Image by S I
Review Image by S I
Review Image by S I
The cover is pretty easy to install. No drilling or anything which makes it easy. Seems pretty durable so far. The only thing I’m not happy about is the cheap weather stripping that has terrible adhesive. One trip on the freeway and it was pulled out from under the cover.
Reviewed in the United States on June 15, 2026 by S I

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