Thanks for the reply and info!
This RPK is definitely heavier than my SLR, and since mine is milled and has a heavy Krebs quad rail, that's saying a lot! The heavy barrel appeals to me for the same reason you pointed out, should definitely have no overheating issues. I also like the bipod mainly because its legs are so long, which I assume must be for clearance with mags. Since I'm a big guy the taller bipod will make shooting prone more comfortable.
Being that I live in Kali, availability of drums makes no difference to me - I can't buy them anyway. Glad I still have mine, though it won't be long before they are outlawed here I'm sure. When that day comes, I already have an adoptive home in Nevada that will house my stuff until I leave this state.
I figured the shop priced the gun at current market value, but since they haven't had it long I don't expect it to drop anytime soon. It gets a lot of attention and draws people to the rack. I know this shop, they won't deal this soon.