When we polled 14 experts as to what ammunition they would choose — 9mm or .45 ACP — the answer was pretty much unanimous: 9mm.

Well it turns out that spec-ops Marines have come to the same conclusion.

Maj. Nick Mannweiler, a spokesman for Marine Corps Forces Special Operations Command (MARSOC), recently told Marine Corps Times that the “9mm Glock 19 is the only pistol that Marine special operators can take into battle.”

Since last year, MARSOC has purchased and fielded 1,654 Glock 19s because Raiders needed a reliable secondary weapon “that could be used for both a concealed carry profile and a low-visibility profile,” and having one approved pistol for all special operators saves money, he said.

“Based on lessons learned in our operations, we also took into consideration how well a round could penetrate objects of varying densities and in different environmental conditions,” Mannweiler told Marine Corps Times. “We concluded that a 9mm round suited our needs.”

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