Just like Stevo says. Put the screw in from the receiver side into the stock adaptor.There's a threaded insert with a collar on one end that threads into the receiver. Then a regular socket-cap bolt is used to attach the adaptor to the receiver. Same sort of set-up that Rauch Tactical used for their adapters, with the difference that the RT insert didn't have the collar.
I'll get a pic this morning if I get a chance.



























