41.71
Both
Both
No mods
Old saves, new saves
Reproduction steps:
1) Craft or spawn crafted spear(item SpearCrafted), see its weight at 1.7 units.
2) Combine crafted spear(item SpearCrafted) with any available attachment, see its weight at 1.5 units.
I believe current crafted spear weight variable is an oversight. Attaching proper items to crafted spears frankly results in weapons with lower weight variable.