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What Cliff Radical Said.
The SAS ones are a model known as the CT12 (They do not have the drinking tube installed) They were designed for the SAS to use during Counter Terrorism raids...think the Iranian embassy raid in London. These are very very rare.
The FM12 normally comes with the black lenses you require.. they are an anti flash lens.
Lens are not interchangeable and are smaller than a standard S10, drinking straws are longer and the voice emitter is smaller. They are quite Rare.
The S10 is a good bit of kit however due to the design of the eye pieces it does feel claustrophobic and is prone to fogging due to not have a secondary air pathway protecting the lenses.
I have heard good things about the Czech M10 copy. Widely available. Parts commonality with the US M10 and much cheaper than an S10
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