JP
Im not sure what catches fire (Ive never owned a RR). It may be the oil cooler lines like the defenders (which also burn to the ground frequently) Theres a few videos on youtube of RRs burning (apparently the p38s like to burn too) Heres one:
http://www.youtube.com/watch?v=448Zt1CmPtE
and of course Ive actually had a few friends who have had their RRCs burn to the ground.
As for the NV4500 adaptors, Im not sure where they are at now in terms of productions (Its not me thats making them)