1966 Savage 110 question

[Shortbox4x4]

OK so I picked up a nice Savage 110 with a low 100,000 s/n. So from what I understand made in 1966. From the outside appearance the stock is a blind magazine. Not a detachable magazine model 110C. Yes it's a left handed rifle. Caliber is .243win.

So I took it apart last night to go thru it and check for rust, wipe it down etc...None of the action screws are buggered up etc...so I'm pretty sure it's never been apart. Well when I took it apart there is a detachable type mag set up and what looks like a liner/extension for the blind magazine/follower etc...All looks factory. I have two other Savage 110c and a magazine will not go in at all but if you would take that liner/extension out it would fit.

Any thoughts? Is that the way these came (mid 60's built rifles) with the blind magazines?

The inletting of the stock area is all factory. For kicks I tried to put the barreled action into a stock that is set up for a regular blind magazine and the inlet is different and it will not go in unless you open up the mag well area.

Thanks for looking!