I'm in the same exact boat as you are. Ordered an L in September and they are telling me the same exact thing about my barrels. We might be in the same batch.I will give Rob Arms credit for responsiveness via email. They've responded within 2-3 days anytime I've had questions about my order or just checked in to see the status. It sounds like the hangups are with the barrels, being manufactured and then having to be sent out to chrome lining.
Hopefully mine will arrive in March. Still waiting for them to contact me for payment (even though I received an email saying they would contact me for payment soon).