BAKFlip MX4 (GEN 3) Hard Folding Tonneau Cover - GMC SIERRA - 448130

The best-selling truck bed cover in the world just got better.

Introducing the new and improved RealTruck BAKFlip® MX4 (GEN 3)—an evolution of RealTruck's most popular tonneau cover. This next-generation upgrade builds on everything truck owners already love about MX4, now enhanced with improved functionality, greater durability, and elevated security.

The new and improved BAKFlip MX4 is constructed primarily from alloy materials, including heavy-duty aluminum top panels and side rails. Reinforced with high-density polymer cores, each panel delivers a 22 percent increase in overall strength compared to the original model.

Security is also enhanced. In addition to BAK's patented auto-latching system, which automatically secures the cover when closed, the BAKFlip MX4 (GEN 3) features re-engineered lock components for improved resistance to forced entry compared to the GEN 2. No matter the cargo you're transporting, you can rest assured knowing your gear's protected.

When the weather turns, the BAKFlip MX4 (GEN 3) holds strong. Revised EPDM rubber perimeter seals and tight-fit clamps provide our best seal yet, preventing seepage between the bed cover and bed rails. At the rear of the cover, a 13 percent longer dual-action tailgate seal provides weather protection for the tailgate. This innovative design also improves operation, maintaining factory tailgate functionality regardless of the cover's position.

The BAKFlip MX4 isn't only durable, it's also sleek and stylish. Unlike competitors, the BAKFlip MX4 sits flush with your pickup's bed rails, practically disappearing into your truck's profile. And with a sleek, textured matte black finish across all surfaces, the MX4 looks great whether open or closed.

Installation is streamlined thanks to an improved click-in mounting system, reducing setup time by 12 percent. Operating the cover is just as simple—drop the tailgate, release the rear latch mechanism, and fold the cover toward the bulkhead. If full bed access is required, fold the cover flush against the rear window—third brake light visibility remains unobstructed in any position.

BAK® is a RealTruck® brand. We proudly manufacture and assemble each BAKFlip MX4 at our state-of-the-art facility in Missouri using globally sourced materials. We stand behind the quality of our engineering with a 5-year warranty against manufacturing and material defects.

PRODUCT HIGHLIGHTS

• High-density polymer-reinforced aluminum top panels are 22 percent stronger than the original MX4
• Precision-engineered aluminum side rails and frame
• Striking textured black finish across all components
• Folds against the cab for 100 percent bed access
• Re-engineered prop rod clips for a secure hold
• Premium rubber bumpers protect the cab when folded into the upright position
• Re-engineered automatic latching panels offer improved security over the GEN 2 design
• Comprehensive 3rd brake light visibility in all positions
• Simple one-person installation
• 12 percent quicker installation with all-new click-in design
• Re-engineered perimeter seals and tight-fit clamps for superior weather protection
• Extra-long, dual-action tailgate seal available on most applications
• Integrated water drainage system
• 400 lbs. weight capacity (evenly distributed)
• 5-year warranty
• Assembled in Missouri