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Need some help on deciding caliber for AR pistol

Discussion in 'Rifles' started by JColumbus, Nov 23, 2018.

10.5" 5.56 or 8" 300 AAC

  1. 10.5" 300

    7 vote(s)
    41.2%
  2. 8" 300

    5 vote(s)
    29.4%
  3. 10.5" 5.56

    6 vote(s)
    35.3%
  4. 8" 5.56

    2 vote(s)
    11.8%
  5. Thanksgiving dinner was great!

    2 vote(s)
    11.8%
Multiple votes are allowed.
  1. JColumbus

    JColumbus Well-Known

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    So how long is a long barreled pistol? Would a 10.3" (2.3" longer) really be a dramatic improvement in accuracy, distance, and impact? If so, does that mean that it would be fine in 5.56 too?
     


  2. JColumbus

    JColumbus Well-Known

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    Jun 28, 2012
    AHHH gotcha. Yea I haven't shot the PDW brace yet, but it extends outward pretty comfortably. Feels just like... You know...
     
    DD130 and grasshopperglock like this.
  3. HKShooter65

    HKShooter65 Well-Known



    This is such a pervasive misperception!!!


    Shorter barrels are NOT inherently less accurate.

    Shorter sight radiuses contribute to this erroneous belief.

    I have a 5" suppressed AR15 upper in .22LR that will shoot 1.5" groups at 100 yards all day long. It's a quality barrel.
    I had a P.O.S. AR15 5.56 upper that shot 6" groups.

    Quality of the barrel innards is everything.
    Length is a lesser contributor to accuracy.
     
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  4. Charlie

    Charlie TGT Addict TGT Supporter

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    Were I you, I'd invest is a couple of factory loads, 168 gr., etc. and see how it shoots. Just to see what you like.
     
    Last edited: Nov 24, 2018
  5. CyberWolf

    CyberWolf Active Member

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    Not necessarily, depends on what you got...

    ^This is a good perspective, just depends on what you're looking for.
     
    Last edited: Nov 24, 2018
  6. CyberWolf

    CyberWolf Active Member

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    A short 5.56 may not have the terminal ballistics of a 20" rifle pushing projectiles at >3k fps, but most definately not a toy, and can still poke holes in things from much farther than one might expect.

    Also, if you use either a flash can or Linear Compensator (depending on needs with regard to backpressure management), nearly all of the concussive force is pushed forward and is not too bad at all, even for people standing next to or behind the shooter.



    They are not inaccurate, but you need to make sure you're using the right ammo.
     
    Last edited: Nov 23, 2018
    Dad_Roman likes this.
  7. benenglish

    benenglish Lifetime Supporter Staff Member Lifetime Member Admin

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    Spring
    I know you know this but it bears repeating - All else being equal, shorter barrels are more accurate than longer barrels. Granted, all else is almost never equal but that doesn't change the correctness of that assertion.

    Pistol silhouette shooters taught that lesson to the shooting world back in the 1970s. It continues to amaze me how many people have yet to get the word.
     
    CyberWolf likes this.
  8. CyberWolf

    CyberWolf Active Member

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    Charlie likes this.
  9. DD130

    DD130 Active Member

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    Unless you have a specific need for a .300 BLK, I'd consider building a 7.62x39 AR instead. The 7.62 has the power of the .300 (a little bit more depending on who you believe), and it's MUCH cheaper to shoot than the .300 BLK, and ammo easier to generally acquire as well.

    I've built versions of .233/5.56 & .300 BLK and 7.62x39, and frankly, the .300 BLK sees the least range time, because it's just more expensive to shoot, the 5.56 is not as intimidating for the younger in my family and the 7.62 give me the chuckles on the cheap. I built my .300 as a pistol because it only needs about 10" of barrel to get up to speed, but I might just toss a .556 upper on it and actually go shoot the thing.

    I had 6.8 SPCII for a while as well. Stout round.. but.. I didn't really have a need it satisfied, that other calibers didn't.. so it exited the fleet.
     
  10. Charlie

    Charlie TGT Addict TGT Supporter

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    If you are a hand loader, there is not a significant difference in price of the rounds of any of the calibers you're talking about. I load 7.62 x 39 for accuracy in my CZ 7.62 carbine.
     


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