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300 blackout build 18" barrel

Discussion in 'Black Rifle Forum' started by KK40384, Nov 6, 2012.

  1. KK40384

    KK40384

    978
    7
    Jun 19, 2009
    Michigan
  2. WoodenPlank

    WoodenPlank Who?

    7,958
    3
    May 15, 2010
    NW Florida
    First time I have seen an 18" barrel for .300BLK....
     


  3. I bought an upper assy. from 556 tactical with that barrel and it is very accurate. An 18 inch barrel really isn't going to have any benefit over a 16 inch barrel from the information i have read. It was the only upper i could find locally at the time so i bought it and i have been very pleased with it so far.
     
  4. KK40384

    KK40384

    978
    7
    Jun 19, 2009
    Michigan
    I know it doesn't offer a lot of benefit over the 16" but I'm going for the SPR look so I wanted 18".


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  5. You will be very pleased with that barrel, it shoots sub moa at 100 yards.
     
  6. KK40384

    KK40384

    978
    7
    Jun 19, 2009
    Michigan
    I guess I'll order one then.


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  7. AK_Stick

    AK_Stick AAAMAD

    17,397
    1,121
    Jan 20, 2004
    Alaska, again (for now)
    300 blk in an 18 inch tube seems an awful lot like wiping with steel wool.

    Sure, you can do it, but it doesn't make any sense.
     
  8. mjkeat

    mjkeat

    3,447
    3
    Jun 17, 2009
    Midwest
    I agree. The round is designed around the SBR. All that extras barrel is a waste/hindrance.
     
  9. oldtimer48

    oldtimer48

    63
    0
    Jan 20, 2009
    Lynchburg,VA
    i have a friend, co- worker that built a 300 blk out with a wilson 16" fluted barrel. it is very accurate 100-300 yards. the local range only goes to 300 yards. when i get ready to build that is the direction i am going. i like the fact you can hunt with it verses 223 or 5.56. his average group size runs about a 1"-1 1/4" at 100 yards.
     
    Last edited: Nov 9, 2012
  10. Gunnut 45/454

    Gunnut 45/454

    12,129
    9
    Jun 20, 2002
    Yep max effiecient powder burn is all done by 16"! Any extra barrel lenght is useless! May look nice but your just carry extra wt for nothing. If you are set at 18" make sure you have a CARBINE gas lenght or you'll not get full function except with Suppers and even then it might cause problems! No Mid or rifle lenght gas systems. I have a 16" carbine and it a great round to shoot - so nice punching .30 caliber holes in stuff in an AR platform! I can run subs or suppers out of mind with zero problems. I don't run surpressed at all.:supergrin:
     
  11. KK40384

    KK40384

    978
    7
    Jun 19, 2009
    Michigan
    It does have the carbine gas length.


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  12. RWBlue

    RWBlue Mr. CISSP, CISA CLM

    23,523
    832
    Jan 24, 2004
    + 1

    And this is from a guy who has the 300-221.
     
  13. Gunnut 45/454

    Gunnut 45/454

    12,129
    9
    Jun 20, 2002
    KK40384
    Then you should be ok as for feeding subs/suppers. All depends on the port size some barrel makers are using different ports sizes so the use of subs to suppers may work great or maybe problematic. My 16" Carbine CMMG works very well with either. Good luck with it, come back with some Chrony results I'd be interested see what you get for velocity.
     
  14. KK40384

    KK40384

    978
    7
    Jun 19, 2009
    Michigan
    Will do. Barrel should be in by Tuesday then I have to find time for it to assemble the upper.


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  15. RWBlue

    RWBlue Mr. CISSP, CISA CLM

    23,523
    832
    Jan 24, 2004
    First shot of subsonic in a cold barrel will be much slower than the remaining shots.

    This will chance POI significantly at 100 yards.
     
  16. KK40384

    KK40384

    978
    7
    Jun 19, 2009
    Michigan
  17. mjkeat

    mjkeat

    3,447
    3
    Jun 17, 2009
    Midwest
    So did you end up getting the 18" barrel?