Search  for anything...
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")

  • Based on 574 reviews
Condition: New
Checking for the best price...
$1,049.99 Why this price?
Save $150.00 was $1,199.99

Buy Now, Pay Later

As low as / mo
  • – Up to 36-month term if approved
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 9 left in stock, order soon!
Fulfilled by Trends Auto
Arrives Friday, May 8
Order within 3 hours and 5 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

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: Tailgate


Brand Name: RealTruck


Manufacturer Part Number: 448131


Manufacturer: BAK


UPC: 192631020486


Automotive Fit Type: Vehicle Specific Fit


Global Trade Identification Number: 86


Model Number: 448131


Unit Count: 1.0 Count


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


Manufacturer Warranty Description: Extended 5 Year Warranty


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


Item Weight: 71 Pounds


Material Type: Aluminum


Lock Type: Tailgate


Style Name: BAKFlip MX4


Exterior Finish: Aluminum


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, May 8

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Sturdy, solid product!
Style: BAKFlip MX4 Size: 6' 7" Bed
Bought this for my husband’s 2019 Chevy Silverado. He loves it still, 4 years later! Fit perfectly, easy to install, very functional, secure, water proof. Definitely worth it!
Reviewed in the United States on February 27, 2026 by Victoria
    • Not worth the money
Style: BAKFlip MX4 Size: 6' 7" Bed
Review Image by Samuel Scavone
Review Image by Samuel Scavone
Quality appears good. It fit well. However there were no instructions, and the videos that they have posted are worthless. It doesn't mention half the parts. Was also missing a screw, and the masking tape that they used to cover some pre-drilled holes left permanent marks on the cover on both sides. Also had a big scratch, but it's on the underside. And it costs over $150 to return this item so I kept it. Definitely would not buy it again. ... show more
Reviewed in the United States on March 8, 2026 by Samuel Scavone
    • SWEEEET!
Style: BAKFlip MX4 Size: 6' 7" Bed
Easy to install, took me well under an hour. Good quality, really sturdy with some very nice features. One of my favorites which makes this hard folding cover stand out is that it folds up to an upright position parallel with the rear cab window and comes with braces on both sides to hold it there. This allows you to utilize the entire bed of the truck when needed. A lot of the other versions of this type I saw didn't have this so when you folded it back you would lose the functionality of about a foot or so of bed space. You get a truck for when you have to move things, you don't want to fool around with limiting your available capacity when you need it most. This is easy to install, easy to use, improves the security for items in the bed of your truck and allows you to retain the use of more of your bed space when needed. I would definitely buy this again. ... show more
Reviewed in the United States on June 2, 2019 by David D.
    • Not bad, install sucked.
Style: BAKFlip MX4 Size: 5' 10" Bed
The cover does look very nice. Took me a few hours to install mainly because the manual isn't that great. Would be nice if you had a video for this specific one to install on the carbon fiber beds. I'm sure I could've installed in half the time without having to read the terrible manual on my phone. My biggest issue is the latches don't latch when I drop or even slam the cover. I have to kind of pinch the cover and the rail together so it'll latch. I don't see any way to adjust for this. ... show more
Reviewed in the United States on August 13, 2025 by Kyle Hart
    • 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.
    • Terrible directions for install.
Style: BAKFlip MX4 Size: 5' 10" Bed
Great products but directions are horrible. I’m sorry but paying over 1k, there should be good directions to install. Instead, I got a QR code that didn’t have how to install in my application.
Reviewed in the United States on November 22, 2025 by Amazon Customer
    • Love it, perfect fit
Style: BAKFlip MX4 Size: 5' 10" Bed
Review Image by 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.
    • CarbonPro Buyers BEWARE!
Style: BAKFlip MX4 Size: 5' 10" Bed
I'm sure that for a standard metal bed the cover is fine, but on a CarbonPro bed I'd wait until a different manufacturer comes out with something better. Installation process is awful, it involves drilling holes and aligning a metal clip to do so. The clip is a real pain to get aligned correctly. And you have to do this 10 times. There is not a clip anywhere near the very rear of the cover so it increases the gap over the lift gate even more. The fit and finish is awful. There are gaps in the components that I believe are unacceptable, their support however feels they're just fine and within spec. Their support is marginal at best. They'll try to get you to do a bunch of legwork to try to compensate for the fact the cover is too small, leaks to the point of wondering if you even have a cover on the bed. The strap attachment points when you flip up the cover leave dents in the cover, I'm sure their support also thinks that this is perfectly fine (I haven't contacted them about this). Their support is generally fine with taking your money, providing a mediocre product and implying that you installed it wrong. I unfortunately will end up keeping it though as there aren't any better options. ... show more
Reviewed in the United States on February 21, 2024 by Rob Tucker

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...