Well known gun writer Ronaldo Olive writes …
This duo of rifles is in current use by Rio de Janeiro’s Military Police BOPE – Batalhão de Operações Policiais Especiais (Special Police Operations Battalion). The 7.52x51mm ArmaLite AR-10 Super SASS is the basic weapon for the “men-in-black” snipers, while the lighter 5.56x45mm Colt CAR-A3 HBAR Elite also uses to be around for occasional, specific (closer range, etc) use. The Super SASS is fed with Lapua .308 SCENAR rounds (167 grains, HPBT).
Their war cry? “Caveira!” (Skull)