My personal take is that the multi spring guide rod setups do work, but at a price. Usually it makes tracking your front sight during rapid fire a bit harder by making the path it travels more irregular, and increases the slide cycle time somewhat.
As for the meagnetic add-on, I have to be real suspect of that. Even if it did what it says it does, I would just help tranfer energy to the whole locked up gun rather than the slide, and that strikes me as not being so useful in lighter guns.
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