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The firing selector switch is marked for either single shot and safe or semi automatic and safe.
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Trigger mechanism parts may be different.
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Weapons for the US are sold without the military flash hiders and the UK versions have a modified military one that no longer functions as it should.
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Some versions will accept only special magazines .
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Later rifles have an extra machining in the chamber which gives the fired cases a distinct shape (so that civilian weapons can be identified if used in crime)
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