Any Manufacturer can use a patented part as long as they pay royalties.
Most Gun manufacturers will outsource their magazines and sights.
They can spec out different options like bumper pads or folowers...
As with any corporation, if they can turn a profit making it in house they would...
Greg
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If it wasn't for an electrician, you'd be watching TV in the dark. 
Author Unknown
CBOB:0581
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