Need advice on cleaning/lubing my 1892 Grade G

[Roberto S Siciliano]

Hello Folks
I'm a newbie here.
I inherited a Grade G from my deceased Pop and would like to clean and lube the receiver interior and freshen up the stock with some Boiled Linseed Oil.

My gunsmithing skills are not good enough to open this old Gal up so I thought I could just remove the stock and soak the receiver in cleaner a few times then soak it is a lube like Sweet Shooter or Ballistol.

I removed all the screws and the trigger guard and can slightly wiggle the stock but somethings still holding it on and I'm very paranoid about not forcing anything.

I read in another thread here that there's a "sear" that also has to be removed. Is that the little "drift pin" I see on both bottom rear sides of the receiver close to the wood and just above where the trigger guard threads in?
I am at a standstill. Any tips are greatly appreciated.