DI vs. blowback operation for pistol caliber carbines???

Discussion in 'Auto & Semi-Auto Discussion' started by orangello, Oct 26, 2012.

  1. orangello

    orangello New Member

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    OK, so I may not have looked enough, but it seems like the pistol caliber carbines of the AR persuasion were all blowback operated. Why? Would a 10mm not have enough gas to run a DI system? What about a 9mm?

    Edumacation please? :confused:
     
  2. hiwall

    hiwall Well-Known Member

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    Its cheaper to make the blow-back actions. And no real down side as it is much simpler and maintenance-free.
     

  3. SSGN_Doc

    SSGN_Doc Well-Known Member

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    pressures are different. pistol and rifle powders burn different. and yes, simpler in moving parts and manufacturing. making a rifle a blowback is much harder. Pretty sure a DI pistol carbine could be made but gas port locations would probably have to be closer to the chamber, and probably not worth the trouble.
     
  4. locutus

    locutus Well-Known Member Supporter

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    DI or even piston systems could be esily used on pistol caliber carbines.

    But they aren't needed.

    Kinda like a turbocharger on a VW beetle. Could be easily done, but why would you want to??
     
  5. Old_Crow

    Old_Crow New Member

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    Everyone is trying to make smaller pistols with a higher capacity. How does DI fit into that? Kel Tec makes a DI pistol, the PLR,16. Try stuffing one of those bad boys in your pants.
     
  6. Overkill0084

    Overkill0084 Active Member

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    DGI could be easily adapted/engineered for a pistol caliber carbine. However, it probably be more expensive, with no actual advantage. Direct blowback is adequate for the job at hand.
    Though I suppose a gas setup might reduce felt recoil somewhat. Simply because of less mass being bounced around. I know my .45 CX-4 recoils more than I would have expected. Certainly due to the big chunk 'o' steel bouncing back & forth.
     
  7. orangello

    orangello New Member

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    Thanks guys; i wondered about cheaper and easier.


    I guess when i see an AR-style firearm, i just wonder "why not DI?". I have heard the horror stories about the early M-16's and had buddies lament their purchases of cheapo ammo that didn't run well in their AR's.
     
  8. TheAlmightyBob

    TheAlmightyBob New Member

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    They have made di pistol caliber ar15. 357 sig, 40, 45 and probably a few others. I looked into getting on but funds dropped off before i could. You probably dont see many because of the headache of finding mags/mag blocks/ lowers that will work with non-9mm chamberings.
     
  9. orangello

    orangello New Member

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    I want to drool over these; do you know a brandname or website or anything?