581 CF Bolt Head Pictures

[trotterlg]

I'm slow on this project due to a lot of work travel. The pictures are what I have done on the 581 CF bolt head for my Hornet Remington 581. I used the Calhoon drawings, but I think they need to be used more as a guideline than exactly. Top picture is the bolt head extractor side with the extractor cut and faced area to drill the pivot hole for the extractor, the second picture is opposite side, 2-56 tapped holes for the ejector plug and fireing pin retaining screws, also at the rear the fireing pin with return spring not seated into position. Larry

http://22-250.com/581BH1

http://22-250.com/581BH2

[Kiwishooter]

What are you going to use for an extractor.

For the L/H 581 I am using the loading port is on the R/H side so it will be a bit of guess work as to where to cut for the extractor.

What material did you use for the bolt head and firing pin?.....Ian

[trotterlg]

The fireing pin is a modified AR-15 pin. I decided to cut the extractor notch and then build an extractor to fit, that way I will only screw up the extractor and not the bolt. The bolt is 4140 steel. Your bolt will look just like this one, you just pin it to the bolt locking lugs 180 out from how I pin mine. Larry

[rayjay]

I was thinking of doing something similar to a Remington 40x rimfire. The problem is that the cross section of the bolt body is not very thick in the area of the locking lugs. The bolt body is counterbored back under the locking lugs and I am worried that the bolt body will flex due to bolt thrust. Eventually the bolt body will probably fail in this area. Also the locking surface of the receiver would be damaged by this flex.

[trotterlg]

The bolt body on the Remington is .125 thick at the locking lugs with the locking lugs being about .075 high and .140 wide, there are 6 of them. Larry

[rayjay]

I just measured a 40x and it's only 1/16".

[Kiwishooter]

Where is the best place to buy a AR-15 firing pin?

Also is your bolt made from full hardend 4140 as described, if so how hard is it on the C rockwell scale. I'm not sure I can buy hardened 4140 here......Ian

[trotterlg]

You will find AR fireing pins near every place that sells gun parts. I did use full hard 4140, it will be easy to find, it is a standard. Start with 3/4 inch diameter, drill the fireing pin hole and then put the holes between centers and trun the bolt to size around the hole, then it will end up in the middle. Larry

[trotterlg]

Finished up the bolt head, it even ejects an empty. Just built the extractor to fit the hole I made for it. Larry

http://22-250.com/BH1.jpg

http://22-250.com/BH2.jpg

[rayjay]

How do you keep it from rotating ?

[trotterlg]

The origional RF head has a groove cut around the part that goes into the locking lug piece that allows the head to rotate, with this one I just cut a notch in it so it is pinned in position and cannot rotate. Larry

[trotterlg]

OK, here it is, put together, fired a primed case and ejected it. Now I guess I will tie it to a tree and fire one for real. Larry

http://22-250.com/CF1.jpg

[Easy_E]

OK, here it is, put together, fired a primed case and ejected it. Now I guess I will tie it to a tree and fire one for real. Larry



Looks great !

I wished I had a lathe and knew how to use it.

[Artpro]

I take it that the 581 is now a single shot? I had Brian Vollker in Iowa modify a 581for me when 17HMR was first announced. We used a 17 Rem CF barrel, cut off in front of the chamber and then threaded it and the action to fit. I've now taken a real liking to my CZ in 17HMR,, so converting the 581 to a 17 Hornet is in the offing. I was leary of that move but with a solid bolthead would make more sense. Where can I get pictures or drawings??
Thanks, Art

[trotterlg]

It is going to end up as a 2 shot, this is a picture of the partly completed carrier that will feed the second round, I just need to mount it and a couple of springs, it feeds if I hold it in place by hand. The round is held in place by the little clip (part of a fuse holder) and the whole thing held down by the bolt head. I will post pictures when it is done. Larry

http://22-250.com/2_shot.jpg

James Calhoon has drawings but they need to be used more as a guideline than absolute fact.