Military tacticians and historians often make use of the term 'tip of the spear.' It refers to a combat force that is used to puncture the enemy's initial lines of defense, to be quickly followed by concentrated forces which destroy any remaining threat.
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Over and under (O/U) shotguns with two barrels stacked on top of each other are used primarily in trap, skeet and other competitive shotgun events where speed of target acquisition and follow up shots is important.