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So im building a .219 zipper on an old 336 action and i have a marlin factory barrel. This barrel has never been mounted and was made around 58-60 (information given to me by seller). Im assuming this is a replacement barrel sold buy the marlin parts division. My question is were these short chambered to allow fitting to the specific action or fully chambered, I haven't got a set of gauges yet but im curious is im going to need a reamer to. Thanks guys.
 

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WW,

You have E-mail

Tom
 

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countryfarmer said:
I would guess short chambered to allow for proper fitting to the bolt.
CF,

No,.........The chambers are all cut to the same dims.......The Br'bolt is fitted for headspace by fitting the locking bolt.

Tom
 

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broncobirnbaum said:
Tomray, please tell more about fitting the locking bolt to get the right head space. Can you describe the process?

That's not something for the novice gun owner to get involved with...........I'll just say Min / Max Sammi chamber gages and a special filing fixture are needed.

When the Max Gage is inserted into the chamber, the lever should NOT come close to closing on it. The locking bolt is then precision filed at 7 degrees in the fixture to allow the lever to come withing about 3/32" of fully closing on the MAX chamber gage...........At this point, if done correctly, the lever will close on the Min gage.

So,.......when completed, the lever MUST close on one, and not the other............The difference between the MIN and Max chamber is about .0035.............Marlin only uses 60% of the allowable MIN/MAX Sammi chamber dimensions.
By that, I mean headspaces on Marlins are set on the tight side of the tolerances....................How the Wiz kids in Ilion are doing this, I don't know................

If you don't have all the tools and some GOOD training.......DON'T ATTEMPT THIS, BOTH SIDES OF THE LOCKING BOLT MUST BE THE SAME to take the bolt thrust load........you'll only screw it up!

Tom
 
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