SnapSafe's largest steel lock box: a keyed 16-gauge case with a 2.5-inch-deep interior and a 1,500-pound-rated cable for full-size handguns.

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Snapsafe A Hornady Company Lock Box - 2XL Keyed Single Pack Black
The SnapSafe Lock Box XXL is the steel lock box to choose when the gun is a full-size pistol or carries an optic. Its exterior grows to 8.5 by 11.5 by 2.5 inches, half an inch deeper than the XL, while keeping the same 16-gauge steel housing, foam lining, and keyed steel lock with two matching keys. The included four-foot steel cable, rated by SnapSafe to 1,500 pounds, loops around a seat frame or furniture leg and locks into the box. SnapSafe lists the steel lock boxes as meeting TSA guidelines for checked firearm storage and as approved by the California Department of Justice for firearm storage. Like every cable-anchored box, it slows a smash-and-grab thief rather than stopping a determined one with tools.
Add the SnapSafe Lock Box XXL, Keyed (75220) to your build and see how it enhances your platform.