|Heavy Machingun, Sniper Rifle caliber|
|Weight:||Projectile Mass 600-1000 grains|
The .50 BMG is a heavy machinegun and anti-material rifle round designed in the early 1910's by John Browning. Based on the .30-06 but greatly scaled up, the .50 BMG first entered service in 1921 in the M2 heavy machinegun being deployed mostly in aircraft. By WWII the .50 BMG was the caliber of choice for both fighter and bomber aircraft, with the P-51 Mustang using six forward firing M2's and the B-17 Flying Fortress mounting up to 13.
Beginning in the 1980's companies began building rifles chambered for the heavy round. After the 1967 record shot of 2,286m(1.42mi) by Carlos Hathcock, the role of the .50 BMG in long-range engagements became clear. Starting in 1982 Barrett Firearms Manufacturing began the production of the M82. Entering service in 1989, the M82 has established itself as the standard long-range weapon of the U.S Army and Marine Corps.
The current record holder for the .50 BMG belongs to Canadian Corporal Rob Furlong. Using a McMillan Tac-50 Furlong hit a Taliban combatant at 2,430m(1.49mi) during the 2002 campaign in Afganistan.