Mostly by price! The "Blow-back" version is the one that cycles the toggle, and the listings would mention that because it's a selling-point. Ordinarily, you'll only see the stationary toggle version for under a hundred bucks, averaging closer to $60.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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