Reinventing the CRF wheel...

[Mohawk Jonny]

I'm not certain this is the right place to post this, but here goes: I'm a tool and die maker/designer by trade and a gunsmith by hobby. I worked in the firearms industry for several years and am a life-long gun crank, so I count myself reasonably competent in those areas of gunsmithing I dabble in.

While sporterizing a VZ24 action, I began backward-engineering the Mauser 98 design on AutoCAD with an eye toward making my own actions. I decided that broaching the raceways as designed would be problematic due to the offset for the claw extractor, but I don't want to build a push-feed action.
I have a bunch of FN Mauser bolt bodies (headless) I got from SARCO. This will allow me to design the bolt head and extractor however I can make it work. I decided to combine some of the features of both the Mauser and newer Savage extractor designs. It's not complete yet, and I'm sure there will be some tweaking and debugging, but I believe I can get the concept to work. I've attached a PDF that shows the basic concept. I believe the spring detent will allow just enough lateral travel and provide enough tension to fairly replicate the manner in which the Mauser claw captures and controls the case rim.
I'm afraid I can't say when I'll have one built, but I'll post the results.

 

[ApacheCoTodd]

Sounds interesting though I'm currently unable to open the PDF. How many pages is it?

Todd.

 

[Ru4real]

Interesting in that it combines attributes from push feed and controlled round feed.

An open question I see is:
Will a standard magazine spring have enough oomph to push the round up to the bolt face?

The time to answer I suppose is trial and error with your first prototype.

Nice work!

 

[Mohawk Jonny]

Sounds interesting though I'm currently unable to open the PDF. How many pages is it?

Todd.

Just one page. I have a couple of PDF "printing" options. Should I try another?

 

[Mohawk Jonny]

Interesting in that it combines attributes from push feed and controlled round feed.

An open question I see is:
Will a standard magazine spring have enough oomph to push the round up to the bolt face?

The time to answer I suppose is trial and error with your first prototype.

Nice work![/QUO
I believe it will be subject to the same problems as the claw-type, in that if there's interference just ahead of the rim, it'll need some backing off so the case can get past the feeding detent. As I've drawn it, there's enough clearance to allow it to function--it's just a matter of how much spring tension I have pushing up against the extractor. As you say, there will be some trial and error--or maybe it will work on the first go-round. Stranger things have happened.

 

[ApacheCoTodd]

Just one page. I have a couple of PDF "printing" options. Should I try another?

Nah - don't change anything.

I probably just have a temporary glitch at my end.

Todd.