The two most common 5.56 rounds are the 55 grain M193 and the 62 grain green-tip M855, both of which are used by the US military. The US-made M855 has a green tip to distinguish it from the M193, so that troops do not shoot the M855 in their M16s, which would fail to properly stabilize the heavier and much longer bullet (length being a primary factor in bullet stabilization). The NATO SS109 62 grain steel core penetrator bullet is used in the M855 round. The steel penetrator makes it more effective at penetrating hard targets and other objects.
62 grain steel tip, full-metal jacket bullets
Muzzle Energy: 1,255 ft. lbs.
Muzzle Velocity: 3,020 F.P.S.
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