Shop › GEMTECH GM-45/BLKSD THREADMNT1/2X28 GEMTECH GM-45/BLKSD THREADMNT1/2X28 $80.75 Gemtech GM-45/Blackside Threaded Rear Mount Adaptor, 1/2-28 Thread Pitch, 9mm 12196 Quantity: Add To Cart Added! Gemtech GM-45/Blackside Threaded Rear Mount Adaptor, 1/2-28 Thread Pitch, 9mm 12196