BAK

BAK BAKFlip MX4 Cover 5'9" for 2019-2026 GMC Sierra 1500 CarbonPro

Name: BAK BAKFlip MX4 Cover 5'9" for 2019-2026 GMC Sierra 1500 CarbonPro
Brand: BAK
SKU: 448135
Price: 1249.99 USD
Availability: InStock

$1,249.99 USD

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SKU:448135

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Key Features

Gen 3 BAKFlip MX4 panels are 22% stronger than the original for added durability
Matte black, low-profile flush-mount design tailored to the Sierra 1500
Carries up to 400 lbs of evenly distributed weight on top
Integrated water drainage system keeps bed contents dry
Tight-fit clamps and improved seals for all-weather protection
Auto-latch locking system secures the bed when closed
Folds forward for near full bed access in minutes
Backed by a 5-year manufacturer warranty

The BAK BAKFlip MX4 (MPN 448135) is a premium hard folding aluminum tonneau cover for the 2019-2026 GMC Sierra 1500 fitted with the CarbonPro carbon-fiber bed and 5'9" box.

Key Benefits

Hard folding aluminum panels that are 22% stronger than the original MX4 for serious durability.
Matte black finish with low-profile, flush-mount styling that complements the Sierra's lines.
400 lb evenly distributed load rating so you can stack gear on top.
Integrated water drainage system and tight-fit clamps keep your cargo dry.
Auto-latch locking system secures the bed when the cover and tailgate are closed.
Folds fully forward at the cab for near full bed access when you need it.

What's Included

BAKFlip MX4 hard folding cover assembly
Mounting clamps and all required installation hardware
Installation instructions

Fitment

This cover fits only the GMC Sierra 1500 equipped with the CarbonPro carbon-fiber bed in the 5'9" (5'8") box length. It does not fit standard steel-bed Sierra 1500 trucks or any Chevrolet Silverado, which were never offered with the CarbonPro bed.

2019-2026 GMC Sierra 1500 (CarbonPro Bed, 5'9" / 5'8" box)

FAQ

Does the 448135 fit a standard Sierra bed?

No. It fits only the GMC Sierra 1500 with the CarbonPro carbon-fiber bed and 5'9" box. It does not fit standard steel beds or any Chevrolet Silverado, which were never offered with the CarbonPro bed.

Is drilling required for this application?

Yes. Unlike most BAKFlip applications, the CarbonPro composite bed requires drilling for installation.

Vehicle Fitment

Years	Make	Model	Submodel
2019–2026	GMC	Sierra 1500	—

Specifications

notes: Assembled in Missouri
finish: Matte black
bed type: GMC CarbonPro carbon-fiber bed (required)
material: High-density polymer-reinforced aluminum top panels with aluminum side rails
warranty: 5 years from original purchase
bed length: 5'9" (5'8") box
cover type: Hard folding
generation: GEN 3
install time: ~30 minutes (drilling required for CarbonPro)
weight capacity: 400 lbs evenly distributed