Received the parts very nicely. The Stock kit were in a sealed bag and the lower part kits were in another sealed bag.
Butt stock: It is black and feels solid. The ruber butt plate feels Ok, door compartment is plastic as well. The compartment area is large but it doesn't have the foam inside. The back screw are not flat like mil-spec stocks.
Tube & extension: Feels solid.
Recoil Spring and Buffer: Recoil Spring is a thinner profile, not as thick as a standard Rifle length rifle and is slightly longer. Buffer has a slightly different profile than standard Buffer as well as the weight I felt less weight than the standard Buffer. What I think is that these are not Mil-spec or every manufacturer has different machinery and ways to make things.
Lower part kits: Some of the parts might be cast and the finish is black paint or nitrite finish. They are really black and doesn't match a lets say PSA lower finish.
The good is that these have lifetime warranty from Trinity.