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I am making a semi auto pistol barrel

Discussion in 'Gunsmithing and Repairs' started by Clark, Jul 7, 2003.

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  1. Clark

    Clark Member

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    I got some Parker Hale .308 Mauser barrels to play with.
    I am cutting one in the lathe to be a Tokarev pistol barrel.
    I think the way the commies made them was on the lath and then welded on the lug that is pinned to the link.

    One problem I will have is the PH bore is .2985" and no stock pilot will fit.
    I will have to pay extra for the 7.62x25mm Tokarev reamer.

    Another is if I have a long bull barrel, there is no way to get the bushing on the barrel. I am going to have to make a bushingless tapered barrel.

    [​IMG]
     

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  2. s&w 24

    s&w 24 Member

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    sounds realy cool. Why a tokarov and not a CZ 52? I will be very interested in the accuracy you get out of it!
     
  3. Jim K

    Jim K Member

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    I have not checked my Tokarevs, but the U.S. way of making that type of barrel was usually by forging the whole thing, drilling the hole and then turning and milling the outside. Some were made in two pieces (like modern BHP barrels) but the bottom lug was always one piece with the breech part. Let us know if the welded on lug works.

    Jim
     
  4. Clark

    Clark Member

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    I have TIG welded on barrels before, and it works.

    I think other kinds of welding get the metal so hot that the heat treat is changed.
     
  5. Jim K

    Jim K Member

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    I wasn't thinking of the heat treatment, I was thinking of the bottom lug breaking off, as it stops barrel recoil. But if you have welded them on before and know it is OK, then it should work.

    Jim
     
  6. Sunray

    Sunray Member

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    What you're doing is experimenting with odd stuff. You'll have to make everything. You obviously have the machining skills so making the parts you need shouldn't be a big deal.
     
  7. Johnny Guest

    Johnny Guest Moderator Emeritus

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    Another interestng project, Clark - - -

    As you are going to a great deal of trouble with machining and all, why not custom-make a bushing for the larger OD barrel. It APPEARS to me that this would be easier than fitting up a bushingless barrel/slide relationship on a non-production arm.

    Best,
    Johnny
     
  8. Clark

    Clark Member

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    Johnny,
    I didn't think about the bushing until I was already into it.
    I was going to use the stock bushing ~.5", but the bull barrel I want to maintain is ~.94", which is larger than the slide of a Tokarev. The bushing inside diameter would have to be larger than the slide the bushing must fit inside.

    The barrel is probably not going to be a tight bushingless fit [given my poor machining skills], and I will have to go thought some hoops to accuraize for the 100 and 200m targets [drill and tap for some screws in the slide and expoxy to fit].

    Today I am working on the scope mount. The idea is to I am making a scope mount to attach with drill and tap to the barrel and sweep back over the slide with a Weaver rail.
    I have been thinking about making the Weaver rail integral with the mount, but I think now I will just do my standard trick and cut up a surplus Tapco AR15 riser and bolt it to the top of the mount.

    [​IMG]
     

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  9. Clark

    Clark Member

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    Everyone who sees it in this state asks, "Is that a silencer?"
    The answer is, "No, that is a bull barrel and it is heavy."
    The barrel weighs 3.7 pounds and the scope mount another pound.

    It doesn't shoot yet.
    I have got the link on and the extractor relief cut, but I am still looking for a cheap reamer. The rental people don't have floating pilot reamers and the retail cost for the reamer is $175.
    That Parker Hale .2985" bore is a real problem.
    I hope the other guys are just screwing them into their Mausers and shooting .308 so they never have to put a pilot in the bore.
     

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  10. Clark

    Clark Member

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    [​IMG]

    [​IMG]
     

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  11. P95Carry

    P95Carry Moderator Emeritus

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    This is intriguing .... and I am an engineer .. albeit - not much ''hands on '' these days. The lathe is languishing!!

    Fascinating ....:)
     
  12. Clark

    Clark Member

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    P95Carry,
    I am an engineer of 25 years, but a lathe operator for only a few hours.

    I am mostly interested in the idea and the performance, not in making jewelry, like I have a choice with my skills:)
     
  13. cpileri

    cpileri Member

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    fascinating

    Clark-
    You have been at thsi awhile, how is it going?
    The long barrel CZ-52/Tok is an interesting project.

    Also, if you are somewhat inclined i have been looking for someone to make a custom Sig 220 barrel: interested in at least hearing about it?
    C-
     
  14. Peter M. Eick

    Peter M. Eick Member

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    Clark,

    If you don't mind me asking, what field of engineering? I have followed your posts with intrigue over the years and as a geophysicist I am very curious.
     
  15. Clark

    Clark Member

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    The long barreled Tokarev project got constipated over money.
    The Parker Hale surplus .308 Mauser barrels have .2985" bore, not the standard .300" bore. The replaceable pilot reamer in 7.62x25mm was a custom order $200. So I finally got a 30 Mauser reamer off the shelf with .299" solid pilot for under $100 last week. I am going to have to lapp out .0005" of the first 1.5" of the barrel.

    I have a BSEE 1978 University of Wash.
    I have been designing switching power supplies ever since.
    I overload them until they blow up.
    Then I fix what ever design weakness was the primary failure and overload them higher.
    That trick has allowed me to make reliable designs in a short order.
    Other designers put a statistical number in an oven and wait.
    I just build one and blow it up right now and fix it right now and blow it up right now....

    Despite all the guns and power supplies exploding around me, I have never experienced any pain from the blow ups. I have been shocked and burned by power supplies and kicked like a mule by guns, but I am still going.

    --
    A society that teaches evolution as fact will breed a generation of atheists that will destroy the society. It is Darwinian.
     
  16. Peter M. Eick

    Peter M. Eick Member

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    I would have guessed EE or ME. My wifes a CE and you seem more adventurous then CE's. Thanks for all the hard information. Your posts are fascinating to those of use with a physics/technical bent.
     
  17. Clark

    Clark Member

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    Peter,
    Most of my adult male relatives are engineers.
    Many of us are gun nuts.
    Most of us are lousy spellers and lousy at music.
    I think we have mutant brains.
    I would never want to be a non gun nut or a non engineer.

    --
    A society that teaches evolution as fact will breed a generation of atheists that will destroy the society. It is Darwinian.
     
  18. Peter M. Eick

    Peter M. Eick Member

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    My family is the same way. All of us kids are Scientists or Engineers. I guess having both parents who are PhD's you tend to learn to think as a scientist. Thanks again for the very informative posts. I particularly like your high pressure loads. Knowing the "real" top end of a gun helps a great deal when I sit down and design loads for my guns.

    Take care and keep safe!
     
  19. Clark

    Clark Member

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    OK,
    It is ready to shoot.
    I am going to shoot it without recoil spring.[​IMG]
     

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  20. Clark

    Clark Member

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    Here is another pic[​IMG]
     

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  21. P95Carry

    P95Carry Moderator Emeritus

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    Shucks!!

    Awaits report of results!:p
     
  22. Kend

    Kend Member

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    You can rent the 30 Mauser reamer here for $25, 4-D Products
     
  23. Clark

    Clark Member

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    I have a 2x7x32 Leupold Vari-II rifle scope on it.
    I was using S&B 7.62x25mm factory ammo.
    The chamber is reamed with a 30 Mauser reamer, but the differences are minute, and have to do with a shoulder angle on a shoulder that is barely visible.
    I used no recoil spring.
    I fed single shot without a magazine.

    At 50 yards I shot two 5 shot groups; 2.1" and 2.5"
    At 100 yards I shot one 5 shot group: 4.2"

    Much better groups would be possible:
    without wind
    with a better rest
    with a shooter who is a better shot with a pistol
    with better ammo.
     
  24. Black Snowman

    Black Snowman Member

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    Fairly impressive results none the less! What ammo were you using? The S&B?

    Now, I have this idea for a completely new autopistol in a wildcat cartridge, you could just whip that up for me right ;) for free of course :D What would the time frame be on that? 10 or 15 minutes :p
     
  25. Clark

    Clark Member

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    At realguns there is the 17-357RG project:
    http://www.realguns.com/

    Joe does everything first class.
    I try to do it on the cheap.
     
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