I've seen two styles. The trigger in my npss came with cast & polished trigger pieces. The trigger on my trail np came with stamped pieces that were rough as heck. Is that what you are talking about?
Not that I've noticed, but there are two trigger assemblies that I have come across on the XL's, one has a stamped housing and the other is cast. Neither has been better than the other. Both needed a GRTIII. pv