Mark11 Plate Compatibility
The Mark11 is compatible with many popular armor plates on the market, but it is not a one-size-fits-all solution. Plate sizing is inconsistent, and many plates are unreliable or under-tested. Unless your plates are specifically mentioned in the list of compatible options, you should check your plate dimensions to ensure they will fit. Scroll down to see different kinds of plates and the exact dimensions of the Mark11.
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SAPI (Small-Arms Protective Insert) is a long-standing military style, with roughly 45-degree shoulder cuts to allow movement of the shoulders. SAPI plates are generally multi-curve (curved on several axis), but can also be made in single-curve designs. The Mark11 has been tested with SAPI plates.
Shooter-cut plates have material removed around the shoulder, increasing shooter mobility. They are often cheaper than SAPIs, but are usually single-curve, making them less comfortable for some users. The Mark11 was designed for Shooter-cut plates.
Swimmer-cut plates offer the most mobility for the user, but sacrifice some protection for the ribcage and lungs. Because they offer less coverage, we do not recommend Swimmer-cut plates unless you have a specific use case.
Full-cut plates are generally rectangular, and are designed for wearing on the back for maximum protection. The Mark11 has a rectangular bag design, so if the dimensions are smaller than the Mark11, they should fit.
Dimensions and compatibility
The Mark11 plate bag measures 12" tall and 10.5" wide. It was built for 10"x12" single-curve shooter-cut plates, and accommodates plates up to 10" x 12.5" (max. thickness: 1.1").
Because of the drop-in design, the Mark11 also accommodates taller plates, like multi-curve SAPI/ESAPI Medium plates (9.5"x12.5"). Small SAPI plates (8.5"x11.5") will fit in the carrier, but may shift horizontally. With the cummerbund attached tightly, it is fairly stable, but a plate shifting under load may allow dangerous exposure of vitals. For this reason, even though it's possible to fit small SAPI plates, we don't recommend it.
DO NOT use 8"x10" shooter-cut plates. They fit in the Mark11, but the design will not fit tightly on the top OR sides of the plate, so it will be able to shift several inches. This can expose your vitals (including heart!), and therefore should never be attempted.
Note: Many companies make armor and call it 10”x12” or 8"x10", but when you measure the actual plate it can be up to .5” larger or smaller, depending on the backing, padding, and milling process. Do not assume your armor is actually at spec.
Because plates differ so much, the best solution is to calculate the overall external size of the plates. They cannot measure more than 26.5" around the top and bottom of the plate, or more than 21" around the thickest part of the plate side-to-side.
If you do not have armor plates yet and would like a quality option that fits the Mark11, you can buy Hesco L210s sold by T.REX ARMS.
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