What does .50BMG mean?

.50BMG in Community Dictionary

The quality when it comes to Barret M82A1 sniper rifle.Easily this is the biggest, fattest, most powerful calibur for a rifle. Has sufficient power to serve as an AT (anti-tank) round. by Jacque ClevelandReport definition
.50 caliber Browning Machine Gun. Used in M2s from the 20s til now. Very powerful, very accurate, and most certainly lehtal. by AureliaReport definition
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