Marlin 336 question

[WNC Seabee]

I was recently given a marlin 336, SN# 2300xxxxx. That would put it at 1977 built. Anyway, it's all gummed up with dried lubricant and 30 years of neglect. Not rusty, just all gummed up.

I see reference to 336A, 336C, and other such model numbers. This one just simply reads "Mod.336".

2 questions:

If I need to swap parts, do I need to research more re: Model designation (A, C, etc.)?

The scope mounts were drilled/tapped entirely through the receiver, is this normal? With the scope rings removed, I can SEE the bolt cycle through the screw holes. Doesn't seem kosher to me. Should I find some plugs? I do not plan on using a scope at this time, but want to keep the option open.

Thanks all!

 

[NCsmitty]

You'll find most of the differences in model designations are sights and stocks and maybe barrel length. Basic design has not changed a whole lot, minor stuff.
You can just put screw plugs in the d&t holes and yes, it's normal.
They're great guns, and with a little clean up it will be fine.

NCsmitty

 

[jmr40]

The scope base holes are normal.

The 336C is a 20" carbine with walnut stock. Later models with a safety are 336CS. Originally a 336A had a longer 24" rifle barrel, but in the newest catalog a 336A has a 20" barrel with a hardwood stock as does the 336W. The only difference I can tell between the A and W models is that the W has 2 barrel bands and the A has 1 barrel band and a magazine end cap. Over the years there have been many versions but other than straight or pistol grips most of the internal parts are the same as NCsmitty stated.

 

[T.R.]

You should install filler screws to keep moisture out of the action. But buy 'em from your local smith since hardware stores do not have the RIGHT ones.

TR