Sorry for the delay, I was out of the office for a bit at a trade show.
Yes, we do plan on another run of RPD receivers. The tentative time frame is sometime towards the end of summer.
We do not have any plans to continue to manufacture the complete RPD firearms as we have exhausted our supply of kits and only have a few distributor orders that will be filled at this point (Atlantic, AIM & RSR for dealers).
I have Type 1 Carry Handle Cut Receivers in stock now, but they generally sell out pretty quickly. We are in a constant state of production for receivers and the rotate what we are manufacturing regularly so we have a pretty steady stream of receivers.
Yes, if you have a serial number just give us a call or shoot us an email and we can provide you some information as to how that serial number left our factory.
Please let me know if there is anything else I can help you with.