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I gotta admit I think Beretta hit a home run with this extension. I wonder if it holds up and if it's patented.
OK - here is their patent: http://www.freepatentsonline.com/6568115.pdf
Looks like the only independent claim, Claim #1, depends on a "spring bearing plate". The Boberg XR9 magazines do not use a spring bearing plate, so if we could make this work with just our spring in there, we would not violate the patent.
Update: Beretta has another independent claim that does not use the spring bearing plate. However, they still depend on a spring, so any Boberg design would not use any spring - it would just be detented in stowed and extended positions.
OK - here is their patent: http://www.freepatentsonline.com/6568115.pdf
Looks like the only independent claim, Claim #1, depends on a "spring bearing plate". The Boberg XR9 magazines do not use a spring bearing plate, so if we could make this work with just our spring in there, we would not violate the patent.
If it holds up I don't think you could go wrong with a flip down finger extension. Free grip advantage without adding to the over all XR9 height. It's a thicker mag plate than the XR9 so maybe more of the flip down extension could be a little higher on the front strap and swing down lower it wouldn't have to change the lower profile of your 7 round mag.
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