Custom Glock 19x PSA Dagger Build How to Fit gen5 slide on gen3 frame

here's the Glock 19x custom PSA dagger lower with the true Glock 19x which is a Glock 19 size slide Gen 5 so the trickiest part about this build was adapting and getting the parts to get the Gen 3 frame to fit the Gen 5 slide..