My experience is that most "Warranty Cards" are just marketing research ploys (especially when sent to a third party marketing firm). I look carefully at the card and if doesn't go directly to the manufacturer and there is no reference to the item I have actually purchased - then I see no benefit & I don't send it in.

That said, one recent product that I purchased and found it valid and helpful to send in the Warranty Card was for a Crimson Trace Laser Sight. Got a life time battery supply, too. They're good people.

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Mitch
SWCA 2438