Not sure about a PKC, but the barrel on a RPK shouldn't be removed [then reinstalled and fired] unless you know what you're doing.
I'm out of the shop until Monday, but I will ask the guys at work for some schematics and instructions for you. Let me know if you need help with any other weapons. If I don't know, I can find someone who does. Don't be afraid to ask.
Since it [most likely] work-related, you won't get into too much trouble if you bypass the filters for an internet search. I still recommend using an MWR machine, rather than your SIPR or NIPR.
Maestro, call me I have some news. And change your location, unless you cut Terminal leave short and went BACK to the Stan. :lol:
Firehead, or you could just tell us how. Then show us the "Starman" video. :lol: