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  #16  
Old 01-18-2020, 04:03 PM
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Quote:
Originally Posted by SecondAmend View Post

From what I've read, at least some procedures that reduce bolt speed in Atchisson pattern .22LR AR implementations include the use of a lower force hammer spring. Failure to reduce the hammer spring force is said to lead to unreliable operation. As I use my AR pattern lowers for center fire as well as .22LR shooting, I have not used a low force hammer spring, or techniques that advise the use of a low force hammer spring.
I use reduced power hammer springs in order to prolong the life of my firing pins.

As I understand all this, the hammer spring works as an a supplementary recoil spring on recoil, so a reduced power hammer spring should produce a higher bolt speed. My experience is that a reduced power spring only slightly increases the force with which the spring housing seems to hit the back plate. The reason the difference is so modest is that the bolt speed is high no matter what one does with the springs.

I've used a heavy duty hammer spring (Larue), and a heavy duty recoil spring with subsonic ammunition and still gotten perfect function.

Last year, Ilhondo and I kicked around some ideas for increasing bolt weight. His concern was that the too light bolt was interfering with accuracy. I experimented with tungsten derby car weights, and he may be looking into something more elegant, but part of the issue with these solutions, as with the ABW, is cost. An ideal solution may add a couple of ounces and be cheap and durable.
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  #17  
Old 01-18-2020, 04:41 PM
SecondAmend

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With respect to the cost of ABWs for Atchisson pattern .22LR assemblies, the internal and external diameters of a Hillman 3/4 x 1 x 2 Steel Spacer (generally sold for about $2 at hardware stores) appear to be the same as a Ciener ABW. If you have access and ability to use the appropriate machining equipment, it appears that a Hillman Spacer could be cut in half lengthwise and notched and cut appropriately to make two approx. 1 oz. ABWs for .22LR Atchisson pattern assemblies. I don't have such equipment or training for its use so I can only write hypothetically.
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  #18  
Old 01-18-2020, 08:53 PM
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Quote:
Originally Posted by SecondAmend View Post
I don't have such equipment or training for its use so I can only write hypothetically.
That my problem too. I used to have machinist client who could do these odd jobs for me, but I'm just a step above the sort of fellow whose tool kit is a kitchen drawer with a screw driver and pair of pliers in it.
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  #19  
Old 01-19-2020, 02:04 PM
Mike_AK
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I wonder if some handy person could drill a blind hole in the bolt and epoxy in a lead weight?
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  #20  
Old 01-19-2020, 04:35 PM
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Originally Posted by Mike_AK View Post
I wonder if some handy person could drill a blind hole in the bolt and epoxy in a lead weight?
Or threaded holes into which tungsten rod could be screwed.

There's a lot less truly empty room between the bolt and back plate than the BCG sitting in the package would suggest. The hammer swing consumes a lot of the that "free" space.
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  #21  
Old 01-31-2020, 05:52 PM
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I just received the revised version of the buffer with a stepped guiderod hole. I wasn't expecting that. Very sophisticated.
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