I will not purchase again and regret purchasing this one but I’ve chalked if up as a loss. It is not machined out properly to glock manufactures specifications whether it be slide parts or the slide to the frame. To began with the diameter for the plunger on the slide is not large enough for G19 slide parts after market or stock manufacturer. I tried 4 different slide parts kit and none of them fit. I sent back to AoA and they said it fit with their slide parts kit and sent it back installed “as a courtesy” with photos but none actually loading a round in the chamber. I found it comedic because it states it fits manufacturer parts but it does not and there was nothing back on it fitting anything glock except going on a stock frame. It fitting in the frame was never a concern. After receiving the slide back with the new AoA slide parts kit installed already, I put it on a Glock frame with a Glock magazine with Hornady hollowpoint rounds and it would catch the top of each round as it loads the one before it. It slows down the slide where it won’t complete a cycle after it is fired. I’m having to mill it down myself because I’d rather not fool with AoA with it anymore because it seems they’ve done enough giving me a slide parts kit as courtesy because all the others didn’t. I have built several blocks with after market parts and have even done a handful of P80 builds; this is the worst by far that I have worked with. Lastly the cut out for an optic on the slide doesn’t even fit a Vortex which is one of the most common manufactures for optics these days.