EBR Subsonic ammo is the best 5.56 ammo for people who need to stay quiet. The subsonic design prevents most of the noise associated with shooting, although it is still wise to use hearing protection while shooting them.What is 5.56 ball ammo?
5.56mm Military Ammo. The 5.56 mm Cartridge was officially adopted by the U.S. Army in 1964 under the nomenclature: "5.56mm Ball cartridge M193". It was developed from the .223 Remington in a design competition to replace the 7.62mm cartridge as the U.S. military standard.