Modularity is the new gospel in modern firepower, and the FN SCAR just drips with it. The upper receiver starts out as an extruded bit of aluminum, while the polymer lower contains the fire control system and secures the magazine. There are two major subtypes. The SCAR-Light (SCAR-L) runs 5.56x45mm. The SCAR-Heavy (SCAR-H) chambers 7.62x51mm.
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