I'm still waiting on a warranty trigger pack, a bbl and a pistol brace assembly...also since July.
Personally, I think what's going on is parts orders are taking a back seat to building complete rifles. If a component might complete a rifle/pistol....you're not getting that part until demand for complete firearms slows enough to allow them to fill parts orders.
The brace I ordered was "in stock" when ordered and needed paint. But, then they put it on a pistol they must've sold instead of shipping it to me.
I know the trigger packs have been a problem due to supplier issues. Whoever cut the warrantied set wrong, cut the next set wrong too....and RA is moving that job in house now.
Not sure what's up with the bbl, but bbls have always been slow to get.