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In page FN FAL:

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Steyr-built StG 58s had a hammer forged barrel. Some StG 58s had modifications made to the fire mode selector so that the fully automatic option was removed, leaving the selector with only safe and single-shot positions. The StG 58 was replaced by the Steyr AUG (designated StG 77) in 1977, although the StG 58 served with many units as the primary service rifle through the mid-1980s.[citation needed]