the ones Top Notch/Black Market Parts offer are either made by Top Notch or SW/CA (or whatever). I don't know if the ones Adam has for sale on HKParts, are the same?
They're the same. If you read hkparts.net's description for the GG conversion they sell, it's cribbed straight from Top Notch's site and Top Notch links hkparts.net on their site, too.
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