I picked up an RPK from my FFL on Sunday. Wow, if you like AKs, this thing is worth a look. Anyway, I'm a project and tinker kind of guy so I thought I would pass on a few things that I just learned (to hopefully save someone else some time)
For starters, the RPK came with a PKM bipod. The problem with this is that it moves a lot and it's too short. If you put the 40rd mag in the gun, you cannot set it down. A true RPK bipod is several inches longer. I begain the project of cutting the century weld on the bottom of the muzzle nut, then started to remove it. Here is a big tip. The thread are 14x1 but they are LEFT handed. I have only ever put a compensator on my AR so I didn't know this. Now I do.
When you are removing the muzzle nut, be aware of the pin on the FSB that pops into the grove on the muzzle nut. Push the pin in while you turn the muzzle nut clockwise to remove it.
After that, there are two pins on the FSB you have to knock out. They are bastards on some guns. The one on a friend's RPK came out easily but mine were horrible. I broke a couple of punches to get my FSB off.
Once the FSB is off, you slide the true RPK bipod on, restore the FSB and put on a more authentic U.S. compliant part / AK brake.
While I was ripping things apart, I took all the furniture off and cleaned it thoroughly. I let it dry and tonight put on the first coat of stain. Tomorrow night and Thursday night I will spray it with poly and wipe it down with 0000 steel wool to knock the shine off. I'll post up pics when I'm finished if anyone is interested in seeing my new toy.
At $399, even if you keep it as delivered from Century / Classicarms it's a cool gun. It's the big brother my SAR2 has been waiting for.
If anyone knows where I can get a wood grip for it, let me know. The pictures I see of RPK's have wood grips like this:
