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How to expand the magazine capacity from 3 to 5 rounds on a M-70.
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May 14, 2024 - 10:40 am
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Hi,
I have a 1980 Winchester M-70.
It was converted from 30.06 to .308.
I would like to expand the magazine capacity from 4 to 5 rounds.
I have the problem, that it does not repeat round 4 correctly and round 5 does not fit.
Can someone tell me what part I need for this?
A short action magazine follower?
Another magazine spring?
Another magazine box?
Do I have to change something on the stock or will another magazine box also fit?

It would be nice if you could tell me the right part numbers or a link to an Ebay or other online offer.
Thank you very much.

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May 14, 2024 - 4:04 pm
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Hi Steffen-

Unfortunately I do not know about the parts make-up of the post-63 Model 70. Frown

Being a 1980 rifle, I presume that it’s a post-63 push feed action and was made by Olin Corporation prior to sale of the business to US Repeating Arms Company in 1981.  Unless I’m mistaken, the 1964-1981 Model 70s still had only one action length (no “short actions”), so adapting the receiver to different cartridges was done with internal parts (as was the case with the pre-64).

In the case of the pre-64, to switch between 30-06 and 308 you needed a new magazine box (#5), short follower, short magazine spring, longer ejector (#4), and “220 Swift” bolt stop extension. The latter, which limited bolt throw, was part of the extractor collar (for the claw type extractor that post-63s don’t have).  I don’t know how it was done on the post-63s.  Everything dropped into a standard receiver, with no modification either to the receiver or stock.  These parts would be different on the post-63 Model 70, but the same changes would have to me made.  

Can you find a parts diagram (exploded view) of the post-63 push feed Model 70, maybe Numrich Arms?  If so it’ll give part numbers…

Good Luck!!!

Lou

WACA 9519; Studying Pre-64 Model 70 Winchesters

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May 14, 2024 - 4:14 pm
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Try looking here:

https://www.gunpartscorp.com/gun-manufacturer/winchester/rifles-win/70-post-64-pf/parts-list-70-pf

If they haven’t been replaced on your rifle, I think you need at least parts 60, 61 and 62 on their diagram.  The standard floor plate should work (???).  Since the extractor/ejector are integral to the bolt, they should also work (???). 

I do not know how bolt travel was controlled on a post-63.  Maybe a different Breech bolt stop (part 36)??? The pre-64s only used one size bolt stop lever and bolt throw was adjusted by adding an extension to the extractor collar.  I’m guessing that on the post-63s they just used a longer bolt stop with shorter cartridges???

Most of these parts seem to be available for purchase from Numrich… 

Lou

WACA 9519; Studying Pre-64 Model 70 Winchesters

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May 15, 2024 - 11:22 am
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Thank you, Louis, for the help!
The parts list is a good info.
Bolt travel was controlled by different bolt stops as you assumed.

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