I'm probably repeating what's already known here, but since I didn't check...I've enclosed a few links to Gregor's You Tube page where he discusses the K1. From initial testing to full disassembly, to barrel replacement for improved accuracy there are several videos he's produced.I hope you find them useful.
full disassembly: Full review with replacement barrel:
You'll see other K1 videos he's produced if you view his page.
full disassembly:
You'll see other K1 videos he's produced if you view his page.