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What type of rifling did Heckler & Koch develop, known for its high accuracy and increased muzzle velocity?

Cut rifling
Button rifling
Broach rifling
Polygonal rifling

Answer

Heckler & Koch developed modern polygonal rifling, which is known for its high accuracy, increased muzzle velocity, and extended barrel life. Polygonal rifling features a series of curved, rather than straight, grooves inside the barrel, which reduces friction and wear on the bullet and barrel.