I just finished reading "American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History" by Chris Kyle, a former Navy Seal with 160 confirmed kills. He spent 3 tours in Iraq and was active in all the major campaigns. He goes into great detail about the firearms the Navy Seals currently use. Their issued small arm is the Sig P-226 in 9 mm. His opinion from his battle ground experiences is that the 9 mm. round is essentially ineffective against drug-laced insurgents. They would take several hits without going down. He bought a Springfield Operator in .45 ACP that he used with much greater effectiveness, and eventually replaced that gun with a Sig P220 in .45 ACP which he used with great effect. He made no mention of ever using a wheel gun as a Navy Seal.