Does not work with the sig rattler - KNS Precision AR15 Buffer to Picatinny Rail Adapter Kit

The MCX Sig Rattler requires the bolt and piston system to retract about 3/4” into the back of the lower receiver (into back edge of the buffer tube threading). This KNS product screws into the buffer tube threading so that it is flush with the FRONT of the buffer tube threading. It does not allow the bolt to go back far enough to pick up a round. Buy the Sig oem adapter for this and see the difference.