• BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD - Stateside Performance - Tonneau Covers - Hard Fold - BAK - BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD
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  • BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD - Stateside Performance - Tonneau Covers - Hard Fold - BAK - BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD
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  • BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD - Stateside Performance - Tonneau Covers - Hard Fold - BAK - BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD
  • BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD - Stateside Performance - Tonneau Covers - Hard Fold - BAK - BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD
  • BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD - Stateside Performance - Tonneau Covers - Hard Fold - BAK - BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD
  • BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD - Stateside Performance - Tonneau Covers - Hard Fold - BAK - BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD
  • BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD - Stateside Performance - Tonneau Covers - Hard Fold - BAK - BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD
  • BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD - Stateside Performance - Tonneau Covers - Hard Fold - BAK - BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD
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BAK448121

BAK

BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD

BAK BAKFlip MX4 Hard Folding Bed Cover - 6 ft 6 in Bed, Matte Finish | 2015-2019 GMC Sierra 2500HD

$1,249.99 USD
$1,249.99 USD
Sale Sold out
Shipping calculated at checkout.

In stock

The BAK BAKFlip MX4 (GEN 3) hard folding tonneau cover fits the 2015-2019 GMC Sierra 2500HD 6ft 6in bed and delivers flush-mount styling with 22 percent stronger panels than the original MX4.

Install Difficulty: DIY Possible
Clamps to factory bed rails with included hardware and no drilling; typically installs in 30-45 minutes with two people.

Product Overview

The BAKFlip MX4 is a four-panel hard folding tonneau built from heavy-duty aluminum top panels and side rails, reinforced with high-density polymer cores for a 22 percent gain in panel strength over the previous generation.

Security comes from BAK's patented auto-latching system paired with re-engineered lock components that resist forced entry better than GEN 2. Revised EPDM rubber perimeter seals, tight-fit clamps, and a 13 percent longer dual-action tailgate seal keep cargo dry.

The cover sits flush with the Sierra 2500HD bed rails in a textured matte black finish.

Features & Specifications

  • Fits: 2015-2019 GMC Sierra 2500HD
  • 6ft 6in bed length fitment
  • Heavy-duty aluminum panels with polymer cores
  • 22 percent stronger panels vs original MX4
  • Patented auto-latching security system
  • 13 percent longer dual-action tailgate seal
  • EPDM rubber perimeter seals block water seepage
  • Flush-mount design with textured matte black finish
  • Maintains factory tailgate function in any position

Fitment

This part fits the following vehicles:

Year Make Model Submodel
2015-2019 GMC Sierra 2500 HD Base
2015-2019 GMC Sierra 2500 HD Denali
2015-2019 GMC Sierra 2500 HD SLE
2015-2019 GMC Sierra 2500 HD SLT
⚠ Submodel Fitment: If your submodel is not listed in the fitment table above, we cannot confirm fitment. Please contact us before purchasing to verify.

Shipping & Returns

Tracking is typically provided within 3–5 business days; items shipping direct from the manufacturer may take 5–7. Some items are made to order or may be backordered. Questions about stock? Reach us through live chat or email.

Warranty

All warranties are through the manufacturer and are facilitated by Stateside Performance. Some manufacturers require the end user to contact them directly; in that case we will point you to the right contact. Email us with any warranty questions.

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  • Free shipping over $250

    Free shipping applies to items that are shipped via ground through UPS or FedEx and are over $250 going to the continental 48 states. This does not apply to Alaska or Hawaii, and does not apply to any item(s) that are shipped via freight or with any other option other than ground shipping.

    Shipping policy 

  • 30-day returns

    Returns must be requested within 30 days of delivery. Parts must be new, unused, uninstalled, and in original packaging, with an RMA. Some items are final sale.

    Return policy