hi friends and mossberg-lovers,
i have two question on the mossberg 500 trigger housings/trigger groups.

first question:
is there any difference between older and recently produced mossberg 500 trigger groups/trigger housings and all their internal parts?
or can an older, lets say 15 years old, mossberg 500 trigger groups be replaced by a recently produced one or is there anything special i gotta keep in mind?

second question:
are the mossberg 590A1 metal trigger housings/trigger groups interchangable with all other polymer mossberg 590 and 500 trigger housings/trigger groups of any age/production date?

Please also consider to have a look at my question about the "enhanced" OEM trigger of the mossberg 500 ATI scorpion tactical in the main-forum:
viewtopic.php?f=2&t=465103&p=3816645#p3816645

no one any idea?