Just testing my skills on a very tight tolerance part. I missed it on the first try.. Obviously not for use!!!! Still a work in progress.. 
OK.. After minor sanding (and I do mean minor.. Maybe a minute or two...) Functions just like the metal one!!!! I would never fire anything out of a plastic barrel though..
For use or not…I still think you should not post pics like this… One day they will regulate our printers too (even if it may make no sense… but we all know…perception is what counts)
Thanks KimSam! For this morning laugh!
Nice. Love my HK USP.