AR-15 Pistol for Patrol Rifle

Discussion in 'Cop Talk' started by hudson69, Sep 7, 2020.

  1. blueiron

    blueiron

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    One of the headaches of shortened Stoner system weapons is that it was originally designed for a 20 inch barrel and when the Army decided to implement the XM-177 and the E2 follow-on, it had to add a heavier buffer and have a different gas port size. This ended up making the weapon more reliable when fired, but increased the stresses on the bolt and BCG.

    This is also prevalent in the M-4[A1] and commercial variants. When you go to a Springfield Saint pistol with the 9 to 10.5 inch barrel, again the stresses go up even more and was the gas port adjusted for proper lock dwell time. If not, one has premature unlocking while the bore pressure is high and this can cause catastrophic damage, even to Mil grade parts. Extractors begin to tear off cartridge rims. The new 5.5 inch barrel is more so affected.

    The muzzle blast is terrible and the gas column is not fully burned inside such short barrels, unless the ammo maker has compensated for it and I don't know any large makers who has yet. I'd want a can on one if I carried such a pistol.

    Keep in mind that the lethality of the round decreases dramatically as the barrel length in reduced towards 5.5 inches. Such a barrel might make 2,100 fps if one is using the M-193 55 grain projectile. I don't have the muzzle energy figures at present. A FN 5.7x28mm P-90 wouldn't be far away.
     
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  2. rock_jock

    rock_jock

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    Why would you not set it up in 300 Blackout with a can? Go as short as you want, relatively quiet and still have the more power than pistol calibers suppressed.
     
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  3. Newcop761

    Newcop761 CLM

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    I need to shoot some rounds through a chronograph with my PDX.

    It may be a while but when I do I'll post the numbers for each ammo type.
     
  4. walkinguf61

    walkinguf61

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  5. Newcop761

    Newcop761 CLM

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    This is my PDX.

    The "hate brake" parabolic muzzle device is amazing. It makes shooting this thing feel like shooting the wife's 9mm PCC.

    Maxim Defense PDX  - Copy.jpg
     
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  6. ThomasM4

    ThomasM4

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    11.5" or 12.5" milspec barrel A5 buffer system. If you are contemplating a suppressor I would recommend to use the lmt enhanced carrier.
    Factory Ammo hornady 75gr 5.56 super performance. If doing reloads the 77gr nosler competition bullet loaded to 5.56 velocity is supposed to have very similar terminal performance.
     
  7. mmcbeat

    mmcbeat

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    Something to ponder. OK, OK, I realize guns are loud by definition. But an AR pistol is extremely loud, to the point of hearing damage. I had an AR pistol and let it go.
     
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  8. Sgt127

    Sgt127

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  9. walkinguf61

    walkinguf61

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    Or go with a Kel etc SU-16 with a folding frame.

    upload_2020-9-11_13-37-36.jpeg
     
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  10. CAcop

    CAcop

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    Kind of reminds me of the takedown lever action I want to get.

    Winchester and Taylor's and Co. make at least 1 version in a few calibers.
     
  11. ray9898

    ray9898

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    I am simply not a fan of short barreled 5.56's. The cartridge was already designed for a longer barrel and cutting it to 16" was a compromise. The new trend of cutting them short cause the ballistics to degrade rapidly which takes away one the primary benefits of having a rifle. Add to that the increased noise, muzzle flash and how hard it is on the rifle makes it not worth it. Now everyone wants to go short and put a can on it which defeats the entire purpose, you are right back with a carbine length rifle. Might was well go with a pistol caliber carbine, just as effective.


    Add to that this example is talking about a 'pistol' version without a true stock that will absolutely degrade accuracy. If you carry a something so compromised that it no longer has the accuracy or ballistic capability of the real deal then why bother? Get extra mags for your pistol or something.
     
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  12. Sgt127

    Sgt127

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    5AD1CF1A-A199-4C42-AFEA-25B84D512297.jpeg

    My choice for light and handy. The original .300 Blackout.
     
  13. CAcop

    CAcop

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    For awhile the Israeli police carried those with Choate stocks as their long guns.

    When parents took kids on field trips the police would hand out K98s chambered in .308.

    They still have M16s we handed out during Operation Nickle Grass in 73 that they later chopped to 13 inches.

    They hang onto everything.
     
  14. Sgt127

    Sgt127

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    I actually have a Choate stock. I think I’ll put it on one of them.

    Thanks for reminding me!

    It may not be the ultimate rifle in a battle, but damn they are handy and fun to shoot.
     
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  15. hudson69

    hudson69

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  16. hudson69

    hudson69

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    There is my original, and still the best (for me) patrol rifle. In service since 2004. Below is the newest, travel sized addition.
     
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  17. billy_56081

    billy_56081

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    Not a cop here but, I have seen a few AR pistols carried on live pd. On a personal note I have a 10.5 inch with a shockwave brace and would trust my life to it. My nephew used it on 2 deer last year with 75 grain Hornady bthp and one ran 30 yards leaking like crazy and one DRT!
     
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  18. Newcop761

    Newcop761 CLM

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    Billy_ are you sure they were pistols and not SBRs?
     
  19. PEC-Memphis

    PEC-Memphis Scottish Member

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    Doh ?
    For an individual, the tax stamp is not deductible.

    You MIGHT make it a business expense, but I doubt it would pass IRS audit for a personally owned NFA Title II item.
     
  20. billy_56081

    billy_56081

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    Absolutely they were braced pistols.
     
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