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Thread: scratch build 7.62x25 on ak reciver blow back

  1. #81
    Gunco Regular mrtank's Avatar
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    Sarco has the 03 barrels. the 2 groove are supposed to be nice for cast...
    .30 cal (7.62mm) Rifled Barrel Blank
    20 long x .956 diameter rear & .615 front
    diameter from original U.S. Springfield rifle
    barrels. VG-Exc bore condition
    2 groove SPF274 $12.50, 3 for $34.95
    4 groove SPF275 - $16.95, 3 for $48.95

    Second to last page lower left hand side.
    http://www.sarcoinc.com/8-10-09_pgs1-13.pdf

  2. #82
    Gunco Veteran [486]'s Avatar
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    Quote Originally Posted by mrtank View Post
    Sarco has the 03 barrels. the 2 groove are supposed to be nice for cast...
    .30 cal (7.62mm) Rifled Barrel Blank
    20” long x .956” diameter rear & .615” front
    diameter from original U.S. Springfield rifle
    barrels. VG-Exc bore condition
    2 groove SPF274 – $12.50, 3 for $34.95
    4 groove SPF275 - $16.95, 3 for $48.95

    Second to last page lower left hand side.
    http://www.sarcoinc.com/8-10-09_pgs1-13.pdf
    Meanie Mc. linkstealer.

    I'd get the 2 groove because it would cause less pressure allowing a lighter bolt.

  3. #83
    No Hope For Me 1biggun's Avatar
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    damm I looked at that add 3 times thanks for the link. I wonder what one will give the best accuracy with the surpluss ammo???? or if there is a differance. what are the advantages of a 4 grove over a 2???

  4. #84
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    Quote Originally Posted by 1biggun View Post
    damm I looked at that add 3 times thanks for the link. I wonder what one will give the best accuracy with the surpluss ammo???? or if there is a differance. what are the advantages of a 4 grove over a 2???
    More grooves.

    They said it didn't affect accuracy when they issued them, and it has been observed that they have reduced pressures from causing less bullet deformation.

  5. #85
    Gunco Regular mrtank's Avatar
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    Quote Originally Posted by [486] View Post
    Meanie Mc. linkstealer.

    I'd get the 2 groove because it would cause less pressure allowing a lighter bolt.

    You posted as I was logging in for work.

    On another note 1biggun, there also are chrome lined tt barrels out there. would be nice for a simple blow back toy.
    Tokarev M30 / M33 7.62 x 25 Barrel | e-GunParts.com

    All of the surplus 7.62x25 that I have measured was 308 area but if you want to try a looser bore there is the vickers 303 barrels omega has new for $50 is not that bad. I have a deep dark desire of making one of them into a semi heavy barrel for 7.62x39 or 54r..... Barrel Parts - Omega Weapons Systems (520) 889-8895

    Measurements of the vickers barrel in this thread vickers barrel threads - Militaryfirearm
    Turbos build thread of his 303 ak using that barrel.
    brit 303 ak reweld - Militaryfirearm

  6. #86
    No Hope For Me 1biggun's Avatar
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    Xxxx
    Last edited by 1biggun; 05-20-2016 at 09:48 PM.

  7. #87
    No Hope For Me 1biggun's Avatar
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    Xxxcc
    Last edited by 1biggun; 05-20-2016 at 09:49 PM.

  8. #88
    gunco irregular moleman's Avatar
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    1biggun, here is a picture of a d-max rifle. I know its different than what you're doing, but I thought the picture might be of some use. It uses a pps43 looking bolt that uses a sten type extractor and a regular ak style FCG. One of the hammer sear surfaces has been removed to clear the guide rod. Since you're making a new style bolt (not a previous FA bolt converted to semi) you can have feed lip on it and use a plunger type ejector like on the M1 garand, M1 carbine, M14, M16/ar15 ect. I'm thinking about going with a plunger type ejector on a 17hmr build I'm gathering parts for. I had a like new remington 1903a3 (that I'm still kicking myself for selling) with a two groove barrel and it shot very well.
    Attached Images Attached Images

  9. #89
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    Quote Originally Posted by 1biggun View Post
    I reload so using .308 bullets is not a issue and the surpluse stuff is works althogh Im leary of it.
    It won't matter much, if anything the tighter barrel will increase accuracy a bit, maybe if you got the 2 groove the pressures might have been closer to normal with the undersize bore...

    Either way, looks like you'll have a nice cast bullet shooter. Probably won't lead any worse than a rifle, just use straight wheel weights [or other hard lead] and it'll be fine.

  10. #90
    No Hope For Me 1biggun's Avatar
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    Xxxcc
    Last edited by 1biggun; 05-20-2016 at 09:50 PM.

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