GUN Questions about my new AR build: 1x9 v. 1x7

Discussion in 'On Topic' started by Rip The Jacker, Feb 12, 2009.

  1. Rip The Jacker

    Rip The Jacker New Member

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    Just ordered an M4 upper from M&A, they didnt have any with a 1x9 twist, so i ordered 1x7. The guy at M&A told me that it wouldnt be as accurate with 55gr ammo, which is probably what i'll be shooting the most.

    But I'm sick of waiting for del-ton so i ordered anyway.

    Should I have waited?
     
  2. Painkiller

    Painkiller The Synarchy of Molten Bones

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    1n7 or go home
     
  3. Soybomb

    Soybomb New Member

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    Any difference with 55gr will be minimal, I'd rather have 1/7 so you have the option of using heavy stuff too.
     
  4. Rip The Jacker

    Rip The Jacker New Member

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    Good, I lack the patience for this shit.
     
  5. Paul Revere

    Paul Revere OT Supporter

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    for general shooting there is no reason not to get 1:7.
     
  6. Rip The Jacker

    Rip The Jacker New Member

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    Thanks guys. Now I can move on to my SBR's. I'm thinking 7" 9mm + supressor and a 10.5 223 :noes:
     
  7. GlobeGuy

    GlobeGuy New Member

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    How much is it costing you to build a rifle (223) nowadays?

    I shoulda grabbed a bargain bin ar15. :o
     
  8. Rip The Jacker

    Rip The Jacker New Member

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    Uh about $115 for the lower and $600 for the kit i just bought. Shipping included.
     
  9. yar1182

    yar1182 New Member

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    I much prefer the 1x7 or 1x8 twist barrels for the heavier bullets for distance shooting such as the 69gr SMK's or 77gr SMK's. You probably will have problems shooting light varmit rounds (35gr - 40gr).

    The 55gr stuff shoots pretty much out of any twist rate barrel but it's ability an longer ranges is debatable.
     
  10. Rip The Jacker

    Rip The Jacker New Member

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    I wont be shooting much past 100 yards with this one.
     
  11. GlobeGuy

    GlobeGuy New Member

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    That's not bad at all, did you recently get your lower? If yes, where at??
     
  12. Rip The Jacker

    Rip The Jacker New Member

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    yup just got 3 at essential arms.
     
  13. GlobeGuy

    GlobeGuy New Member

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    Ooooh, nice...

    What's the different between hard annodized and "tough coat" ?? I never heard that term before.
     
  14. Rip The Jacker

    Rip The Jacker New Member

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    tough coat is more of a flat black, sprayed on but supposed to be pretty durable. i originally ordered the regular annodized, changed my mind and got tough coat.

    you need to call them alot to get through, well worth it in my opinion.
     
  15. Initial E

    Initial E New Member

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    cant go wrong with that

    but you forgot the can for the 10.5
     
  16. Ebtromba

    Ebtromba Active Member

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    1 : 7 ftw
     
  17. GarandBobcat

    GarandBobcat New Member

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    yeah, you'll be fine with 1:7
     
  18. Does anyone make a 1:8 barrel for the AR platform? Really, that would be ideal. Let's be clear here that while we talk about bullet weight, the real factor that relates to the twist is the length of the bullet. It just so happens that the longer bullets are heavier, so we use weight as it's easier to talk about than bullet length. The 1:9 is good up to about the 70gr. projectiles. The 1:7 is good for up to the 90gr VLDs and SMKs. Keep in mind that those bullets are loaded to an OAL that won't fit in the STANAG magazines designed for the ARs platform. From an academic standpoint the 1:9 twist is plenty, assuming you're not looking to shoot benchrest matches with bullets much heavier than 70gr. It would be interesting to see how accurate a slightly under-stabilized ~77gr. bullet was coming from a 1:9 barrel at intermediate ranges. I'd be willing to bet the accuracy wouldn't suffer significantly. Keep in mind also that overstabilizing a bullet can result in the bullet tearing itself apart in the air (we're talking like shooting 36gr bullets out of the 1:7 barrels) Also, overstabilization robs velocity and leads to slightly decreased barrel life.
     
  19. ZCP M3

    ZCP M3 Active Member

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    My JP Rifles stainless match barrel is 1:8.
     
  20. Forgot one thing... for ranges up to 600 yards, there's little practical benefit to using the real heavy >70 grain bullets. You can easily employ something like a 70gr VLD or a 69gr SMK out of a 1:9 barrel and get better accuracy out of your ammo than all but the best shooters are capable of taking advantage of.
     
  21. Rip The Jacker

    Rip The Jacker New Member

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    I cant afford all these damn tax stamps :hs:
     
  22. Paul Revere

    Paul Revere OT Supporter

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    larue stealth uppers are 1:8
     
  23. LancerV

    LancerV Something Happened OT Supporter

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    What about 80-80gr bullets :o

    Im pretty sure a 1:9 would prob be pretty close to over stabilizing a 36gr< bullet also if you were shooting at distances

    Also I believe you can load 80gr Nosler HPBT in a non throated barrel and fit in magazines. Not even as long as Hornady Amax 75gr
     
    Last edited: Feb 12, 2009
  24. The bullets in the 80gr range are, as far as I know, entirely for competition use. You're looking at JLKs, VLDs, and SMKs in that range. I don't know where you'd even look for loaded ammo with those bullets. Black Hills stops at the 77gr SMKs. Once you're into that bullet weight range (80+) you're well into custom handloads for competition use.

    As for distances, with a good barrel and good ammo (and the skills to shoot accurately enough for it to matter) you can easily use 55gr bullets out to ~300 yards. You'd be overstabilizing a 36gr bullet at ANY range with a 1:9 barrel. The <50 gr. bullets are varminting bullets, and they are designed to be used in much slower twist barrels.
     
  25. Rip The Jacker

    Rip The Jacker New Member

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    http://www.mapartsinc.com/

    They told me 3 weeks, maybe less. Their website is not accurate, give them a call for inventory.
     

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