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Thread: Fs2000 custom build--Input appreciated

  1. #11
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    SS,



    That is correct. Rc 60-62 for target sound about right? Will need normalized post processing, core refined & case hardened (will have to consult treatment sheet to double/triple check). Is going to take a large diameter chunk if I don't want to weld on it--about 2.37+/-. Piece I have will be JUST big enough. I noticed the bolt face on the FS2000 actually fits into an ar15 barrel extension after minor clearancing for the FS's large profile extractor. The opposite is true as well, except that the bolt heads have different engagement depths in regards to head spacing, but at least I can use an M4 as an easy shaping guide for the FS extension.

    2012-11-21_21.20.36.jpg2012-11-21_21.04.37.jpg2012-11-21_20.55.32.jpgAny pointers or input are appreciated.

    Thanks

    D


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  3. #12
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    Cut stock to length, set chuck to cut the eccentric dia. Will make more chips this weekend.

    DFirst cuts.jpg

  4. #13
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    Quote Originally Posted by fileninja View Post
    SS,



    That is correct. Rc 60-62 for target sound about right? Will need normalized post processing, core refined & case hardened (will have to consult treatment sheet to double/triple check). Is going to take a large diameter chunk if I don't want to weld on it--about 2.37+/-. Piece I have will be JUST big enough. I noticed the bolt face on the FS2000 actually fits into an ar15 barrel extension after minor clearancing for the FS's large profile extractor. The opposite is true as well, except that the bolt heads have different engagement depths in regards to head spacing, but at least I can use an M4 as an easy shaping guide for the FS extension.

    2012-11-21_21.20.36.jpg2012-11-21_21.04.37.jpg2012-11-21_20.55.32.jpgAny pointers or input are appreciated.

    Thanks

    D
    http://www.suppliersonline.com/propertypages/8620.asp

    Some interesting data here. Thought this may be of some help at least as an additional form of reference. Interesting !
    fileninja thanked this.

  5. #14
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    Carburize to a total depth of .010 to .015. I think gas carburizing is preferred. Threads are "masked" to prevent fracturing during the torque process.

    -SS
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  6. #15
    Senior Member Reathe's Avatar
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    glad to see another machinist here. i have been thinking on this for a long time and i think the only real snag (i don't own a FS yet so i couldn't be sure) is the case tube system is the shorter case of the blackout going to be an issue with ejection tube?
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    Morality is doing what is right regardless of what you are told. Obedience is doing what you are told regardless of what is right.

  7. #16
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    I would harden 85 to 92 on the 15N scale.

    -SS

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  8. #17
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    Sarge,

    My tester is archaic (but calibrated) and does c, be & a. Rockwell C 60-62 puts me right at Rockwell Superficial 15N 90.3-91.1---Thanks for the input & info.

    D

  9. #18
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    Quote Originally Posted by SgtStrykerUSMC43 View Post
    Carburize to a total depth of .010 to .015. I think gas carburizing is preferred. Threads are "masked" to prevent fracturing during the torque process.

    -SS
    I will have to refill my CO2. Thanks for reminding me.

    D

  10. #19
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    Quote Originally Posted by Reathe View Post
    glad to see another machinist here. i have been thinking on this for a long time and i think the only real snag (i don't own a FS yet so i couldn't be sure) is the case tube system is the shorter case of the blackout going to be an issue with ejection tube?
    Good point. That thought had crossed my mind. The extraction system seems to eat the empties and full loads just fine. This includes both low and high ogive bullets--though the only heavyweights I tried was the 208 AMAX. A 220 round nose may give fits--but then again, if it were loaded to fit and feed from a mag, it looks like it would be ok.Dramp testb.jpgRamp test.jpgBurped rounds empty.jpg
    Last edited by fileninja; 11-23-2012 at 12:51 PM.

  11. #20
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    Quote Originally Posted by fileninja View Post
    Sarge,

    My tester is archaic (but calibrated) and does c, be & a. Rockwell C 60-62 puts me right at Rockwell Superficial 15N 90.3-91.1---Thanks for the input & info.

    D
    I don't believe you can get an accurate hardness using the C scale indenter. Even though we can cross reference harness on the scales, I would source the procedure in order to get accurate readings. Core hardness should be in the low 30's on the C scale.

    -SS
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