Not on point, but may be of some interest
I bought a NOS JP Marlin 1894 , this one in 32/20 and a limited made from 1989-93
On advise from Gunsmith friend on this BB , I replaced the spring with this kit (below) and with a 1 piece SS firing pin...
The difference is night & day in smoothness...
The spring kit includes the lever detent spring (most kits do not ) this alone is worth getting this kit.
These alone will WOW you..the next two are purely optional ..
Later Guns ( not sure when ) had/have a plastic magazine follower ( mine circa 1990 was steel ) I replaced mine with the SS follower. I noted mine had a light ring of fine surface rust on the steel follower
( 25 years old and never fired, but had sat in it box ) the later plastic piece on the newer gun is either orange or black
these are vulnerable to some cleaning solvents.... worth the swap out..IMHO
and the safety cross bolt
I don't use the gun for WAS, just a plinker , but I chose to install the replacement blanking screw
dummy ...
The above parts will transform your NIB gun.... thanks Coffin maker