The Picatinny adapter is 2-piece, with one that inserts into the rear dovetail along with a rail that screws down into it. The hardware was smooth and wholly unsatisfactory, so we changed them with some Quality eight equipment screws. I'm not a Glock guy, but I do have an MCK https://recover-tactical-20-2016941.thekatyblog.com/26347704/new-step-by-step-map-for-glock-stabilizer