How "practical" is a .40 cal AR-15?

Discussion in 'Large-Bore/Small-Bore Rifle/Shotgun' started by cajuntec, Sep 12, 2009.

  1. cajuntec

    cajuntec New Member

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    Never really had a strong desire to purchase an AR-15 before. A couple of fleeting moments, and then a change of heart - but I never really had a reason that I could justify owning one.

    ... until I saw that Olympic Arms makes one in .40, which is my favorite pistol caliber. That got me wondering, and kinda wanting.

    But I also notice that the factory AR-15 in .40 uses "modified" magazines - I think from an Uzi. Hmmmm... I don't know if I want to mess with modifying mags every time I want an extra one.

    Also, would the .40 be practical in a AR platform?

    All the best,
    Glenn
    Last edited: Sep 12, 2009
  2. 40CalJoe

    40CalJoe New Member

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    Pistol caliber carbines have been around for a long time. H&K MP-5, UZI use 9mm, the WWII Thompson used 45 ACP the Germans had a machine pistol that used 9mm in WWII as well.

    The AR-10 shoots a .762 rifle round. I would think it would be more cost effective to take a current pistol round carbine and adapt it to fire the 40S&W. Sort of like the modifications Glock made to the G-17 and called it a 40 cal with the model 22.
  3. Mosin_Nagant_Fan

    Mosin_Nagant_Fan New Member

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    Well, it's probably more practical then a 9mm. :p
  4. Vladimir

    Vladimir New Member

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    Probably not a bad idea. My uncle always swears by owning only one caliber to simplify things :D.

    Something to keep in mind is that the much longer barrel will increase the power of the 40S&W. A .40 from a 16" rifle is not equal to a .40 from a 4" handgun.
  5. Carne Frio

    Carne Frio Member

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    It would be very practical, except that the company that makes them has
    promised to make reliable magazines available and failed to do so.
  6. Deathbunny

    Deathbunny Former Guest

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    Certainly practical, if you want to fire a .40 out of an AR-15.

    For a (all too short) time, HK had an MP5 chambered in 10mm. I liked it quite a bit. BUT.....

    Just my opinion here, but if I'm gonna carry a rifle/carbine it'll be chambered in a rifle cartridge. 9mm and .40 are fine in a pistol, but if I have to carry something the size of an AR-15, then I'll take advantage of its ability to fire a larger round.
  7. GMFWoodchuck

    GMFWoodchuck New Member

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    Plus one here.
  8. JLA

    JLA Well-Known Member

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    it has a barrel, a trigger, and fires bullets.... How much more practical could you get?? Especially if you have a .40 cal pistol and need a quick handling companion for it...;)

    The Bushmaster carbon-15 9mm is a neat toy as well. I like firearms that can hold a ton of ammo and spit it all out on target without recoil. Especially ones that can do it through a supressor, provided you posess the proper paperwork...;)
  9. jjmitchell60

    jjmitchell60 Active Member

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    I own one that is chambered in 10mm so if you want it, buy it. The 10mm Ar shoots great and I do see a much improved performaance of the 10 mm round in a longer barrel;.. Add on top that it is not as loud as a 10 mm hand gun, it is fun to shhot.
  10. glocknut

    glocknut New Member

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    Ewww...just like in the aliens movie! :D:D:D:D

    mike
    gn
  11. LurpyGeek

    LurpyGeek New Member

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    [​IMG]
  12. JLA

    JLA Well-Known Member

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    that looks pretty cool. kinda like something off that game 'Halo' or 'Gears of War"
  13. artabr

    artabr New Member

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    I have a buddy that has a AR set up in .45acp. It uses 45 cal Uzi mags which are getting to be a PITA to fine. Fun gun to play with, but like some of the others have said, I'd prefer to have a standard AR that I know that I can depend on first for business. Later on get something more exotic to mess around with.


    Art
  14. JLA

    JLA Well-Known Member

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    good point art. Really thinkin on it real good and serious. I think thats exactly why i have a 1911. If the SHTF and Im at home when it does, the 1911 will get me to my AR, and the AR will get me to my spare mags and hopefully by the time my spare supply of ammo runs out my wife has more ready for me or the situation is done and over with...
  15. LurpyGeek

    LurpyGeek New Member

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    Never really had a reason? Practical? Do you know who you're talking to?
  16. woolleyworm

    woolleyworm Active Member

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    "practical" is subjective; so I say if you enjoy shooting it and use it, then it's practical. If it sits in a gun safe and collects dust, then impractical. I don't think it would be too bad to have around for home defense either; not a primary, but it should pack plenty enough punch and capacity to be effective.
    I spent the better part of last Friday shooting with a friend at the range; he has an M4 with a .22 conversion; was some serious fun and we must have put 800+ rounds through it. cost for bulk .22 - $15.00; cost if we were using surplus .223 - $300 give or take. same amount of fun either way, but one helluva lot cheaper.
    Last edited: Sep 13, 2009
  17. jacksonco

    jacksonco New Member

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    the FBI issues MP5 in 10mm to field agents (not full auto but double tap bursts) I think that is what I would like to have for my birthday. I guess I will have to settle on semi-auto though but that would be OK with me.
  18. JLA

    JLA Well-Known Member

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    with practice you can be just as effective with a semi auto trigger. i have fired both and much prefer the semi auto trigger.
  19. Suicide*Ride

    Suicide*Ride New Member

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    Unless you already live in a bunker, having more than 1 shooting platform [handgun & rifle/carbine] in the same caliber, saves on ammo you must also carry should you ever have to bug out.

    I'm sure most here will agree.... you'll need to bug out w/a minimum of 4 weapons: a .22 rifle or pistol (for small game), a side arm (to get you back to your Main Battle Rifle), & a shotgun (to take care of everything else!). That's 4 weapons minimum, plus ammunition to have to carry.

    Glenn, something you might want to consider: is giving up the extra range & knock-down power of a common rifle round worth the trade-off of having to carry an extra caliber. Do you think you'll ever need a long distance weapon? If you reload, there's another added cost (or savings) depending on how you look at it.

    You could buy the carbine, & then later on down the road buy seperate uppers to change your 40S&W to say.... a .22LR, or .223Rem., or even .308.... pretty much whatever your shooting heart desires. ;)

    JMHO

    (& welcome to the forum!!)

    SR :)
  20. Trouble 45-70

    Trouble 45-70 New Member

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    If you are going to do a big bore AR-15 what is wrong with the .50 Beowulf?
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