Wasn't the primer rifle, as I recall, simply the GM Cannon II variant of the GM Machinegun? It functioned differently, but I do believe it looked exactly the same.This one.
I can't explicitly remember the other two, but I'm fairly certain they were quite the same as other weapons.
If I might borrow this thread for my own request, I remember there being lineart of the Zanspine's beam shields. Quite a unique setup, being cast down like a cloak. Might anyone have that, as well?