I just finished my first attempt at a Polymer80 Glock frame. There's a little bit of a learning curve to get it right. Luckily there's a wealth of info online aka learning from the mistakes of others. I haven't test fired it yet, but I've got the slide and trigger smoothed out nicely. On this first go I'm using it as a replacement frame for a Vickers G19, which made it a relatively simple parts swapping operation. I need to replace the slide and mag releases, but aside from that it's ready to run.