GUN So an OLL is in my future... school me on AR's.

Discussion in 'On Topic' started by saxman, Feb 24, 2008.

  1. saxman

    saxman Burninating the peasants

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    I know I want to build up something as a "longer" range rifle. I'm most likely to use it at the range doing 100-200 yards. Don't know where there's something longer than that around.

    I don't have any desire for a shorter barreled rifle. I want something that will be very accurate at that range.

    Was looking at the J&T match-15 kit... seems like a reasonable price, and I love the look, but honestly don't really know what parts work well, and which don't. Not sure I really need a 24" barrel though.


    [​IMG]
     
  2. Paul Revere

    Paul Revere OT Supporter

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    shit, for 100-200 yards a 16" barrel would be fine - probably even a 14.5.

    if you want, you can do a standard A2 style build with a 20" upper. that would be more than enough accuracy for 200yds max
     
  3. saxman

    saxman Burninating the peasants

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    I'd be lying if I didn't say I like the look of a longer barrel set up...

    If I'm going to build it, I'd rather not be maxing out it's range on a 200yd range if something as simple as a longer barrel would give me more elbow room.
     
  4. Sardaukar

    Sardaukar Active Member

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    Go with 20", dude. I've read from multiple sources that the effective range of the M16A2 is 600 yards. Even if that distance is exaggerated, you would still be hard pressed to find any range in Northern California that allows
    for anything more than 200 yards. BLM land would be a different story.
     
  5. saxman

    saxman Burninating the peasants

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    What should I know about twist rates? JT offers their barrels in 1x10 or 1x8. Is the main difference here based on what type of ammo I use?
     
  6. XR250rdr

    XR250rdr OT Supporter

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    There is a public range a little east of Sacramento that goes out to 300 yards, 1000 yards for members.
     
  7. sneakyjesus

    sneakyjesus New Member

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    The m16 (20" bbl) will make it to 600 yards for sure.

    As far as info about ammo and twist rate
    http://ammo.ar15.com/

    this site really has everything you probably need to know
     
  8. saxman

    saxman Burninating the peasants

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    Well, I'll dive into it tomorrow after work. Should probably sleep now.
     
  9. ZCP M3

    ZCP M3 Active Member

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    From what I understand you need a faster twist rate (1 in 7") to be accurate with the heavier rounds.
     
  10. sneakyjesus

    sneakyjesus New Member

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    exactly right, the faster twist rate stabilized the heavier rounds. A fast twist rate will/can spin a 55grain bullet too fast and make it keyhole or with the really light rounds, may even tear them apart. Just be sure to know what your purposes are, what ammo you want to use, and pick a twist rate accordingly. likewise, a heavy bullet from a slow spin bbl may keyhole at 50yds.
     
  11. fatmoocow

    fatmoocow bored OT Supporter

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    :bowdown:

    cliffs: Faster twist rate (1:7) is better for stabilizing heavier bullets. Slower twist rates (1:12) are better for light bullets. If you will spend all your time shooting 55 grain stuff out of a 24" barrel at 200 yards I'd go with the 1:10. If you want to pop zombies at 800 yards with 80 grain match I'd go 1:8.
     
  12. ZCP M3

    ZCP M3 Active Member

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    So my 1:9 is potentially BETTER for shooting 50-55gr rounds than a 1:7?
     
  13. ShackleMeNot

    ShackleMeNot MINDSET

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    What is an OLL?

    Get a flattop (A4) 20" with a 1/7 or 1/9 twist and a free floated handguard. There's no reason to get anything else if you are going to be shooting factory ammo out to 200 or 300 yards.
     
  14. ShackleMeNot

    ShackleMeNot MINDSET

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    Yes.
     
  15. s2k

    s2k OT Supporter

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    what about 24" barrels?
     
  16. sneakyjesus

    sneakyjesus New Member

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    = more velocity, a little more range, but the twist rate still applies. Just that 16'' is handier and can still punch holes out to 250+yds, no sweat.
     
    Last edited: Feb 24, 2008
  17. Havoc

    Havoc New Member

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    OLL = Off List Lower

    Just some more California bullshit.

    We can only get lower receivers that aren't on the banned list.
     
  18. McCroskey

    McCroskey Jonny, what can you make out of this? OT Supporter

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    I'm planning to build something like this upper, except in 18 or 20"


    [​IMG]

    That said, my 16" has shot a 1/2" group....once :)

    1moa is doable with a 16" rifle...for 200 yards you don't need a 20 or 24 unless
    you just want one....which is enough reason for me :)
     
  19. Soybomb

    Soybomb New Member

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    A guy named Molon did some tests on ar15 to look at overstabilization of 55gr rounds. There was an effect but nothing that I'd worry about in my shooting unless I suddenly get a whole lot better.
     
  20. saxman

    saxman Burninating the peasants

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    Has to do with the California assault weapon ban. There is literally a list of lower receivers that automatically make the rifle an AW in the eyes of the law. An off list lower does the same thing, but is not on said list, so by itself doesn't automatically make the rifle an AW.

    There is plenty of other rediculous criteria as well that determines if a rifle is an assault weapon or not in CA.
     
  21. hsmith

    hsmith OT Supporter

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    i need to figure out what twist i want for my rifle :o
     
  22. hsmith

    hsmith OT Supporter

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    lol @ ammo.ar15.com

    [​IMG]
    AR15.com user Greenhorn found this round shipped in a new box.
    The damage on the neck of the case probably makes this dangerous to fire.
     
  23. hsmith

    hsmith OT Supporter

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    YOU THINK IT MIGHT BE BAD TO FIRE
     
  24. hsmith

    hsmith OT Supporter

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    and god this is depressing

    Q. So what should I be paying for ammo? Of course that's a question the answer to which might change weekly. Some good baselines (including shipping costs) as of this writing (May, 2002) might include:
    Premium (new) M193: $180/1000 rounds ($0.18/round)
    Surplus M193: $70.00/600 rounds ($0.13/round)
    Premium (new) M855/SS-109: $230/1000 rounds ($0.23/round)
    This is probably a good set of "standard prices" to work from. Obviously you should adjust your expectations based on the type of ammo you're buying.


    :wtc:
     
  25. Paul Revere

    Paul Revere OT Supporter

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    i paid $0.33/round for M193 last week :wtc:
     

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