Looking for a hard tonneau cover for your 2019-2025 Chevrolet Silverado 1500 and GMC Sierra 1500 with a 6'6" bed? The BAKFlip MX4 (Gen 3) Hard Folding Tonneau Cover, part number 448131, is cut for that application. The hard panels protect your cargo from weather and prying eyes, and the folding design opens the bed in one move.
The MX4 is the premium BAKFlip, and the Gen 3 update improves strength, sealing, latching and install speed over earlier versions.
Silverado and Sierra beds haul everything from job-site materials to weekend gear, which is where a cover that locks and still opens fully earns its keep.
Open the bed, keep the cover. Drop the tailgate, release the rear latch, and fold the cover up against the cab for 100% bed access, even for large cargo. Re-engineered prop rod clips hold it open, premium rubber bumpers protect the cab and the cover, and the third brake light stays visible in every position.
Gen 3 strength. The top panels are multi-layer aluminum over a high-density polymer core and are 22% stronger than the original MX4, while precision-engineered aluminum side rails and frame keep the cover rigid. It is rated for 400 lb of evenly distributed weight.
A low, tidy profile. Textured matte black on every component and a flush fit with the rails make the cover look like it belongs on the truck.
Close it and walk away. The auto-latch does the locking, and the re-engineered lock components give this generation better resistance to forced entry than the last.
Edge-to-edge sealing. New EPDM perimeter seals and tight-fitting clamps reduce seepage at the bed rails, the dual-action tailgate seal is 13% longer on most applications, and built-in water drainage moves moisture out of the way.
Check before you buy: It is not compatible with factory bed storage boxes. Also match the bed length shown in the fitment line above.
Assembled in the USA and covered by a five-year limited warranty, the BAK 448131 is the Gen 3 upgrade for owners who want a stronger, tighter-sealing folding cover. Order it from Track Ready Products and check the bed length above.
Installation is a one-person, bolt-on job with a click-in design that is 12% quicker than the previous generation. Most trucks need no drilling or trimming.
Start with a clean set of rails. Position the cover, tighten the clamps evenly, and run it through a full open and close cycle to check that it moves freely and latches.
After the first week of driving, recheck the clamps and retention hardware for tightness, and check them again now and then. Wash with mild automotive soap and water, keep the cover secured at all points while driving, and clear snow and ice before opening.
