Firearm & Gun Forum - FireArmsTalk.com > Long Guns > Auto & Semi-Auto Discussion > DI vs. blowback operation for pistol caliber carbines???

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Old 10-26-2012, 08:43 PM   #1
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Default DI vs. blowback operation for pistol caliber carbines???

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?

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Old 10-26-2012, 11:53 PM   #2
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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.

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Old 10-27-2012, 12:01 AM   #3
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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.

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Old 10-27-2012, 03:00 PM   #4
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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??

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Old 10-27-2012, 03:20 PM   #5
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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.

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Old 10-27-2012, 03:26 PM   #6
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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.

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Old 10-27-2012, 05:23 PM   #7
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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.

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Old 10-27-2012, 07:45 PM   #8
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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.

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Old 10-27-2012, 08:00 PM   #9
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Quote:
Originally Posted by TheAlmightyBob View Post
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.
I want to drool over these; do you know a brandname or website or anything?
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Old 10-27-2012, 09:25 PM   #10
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http://bazookabrothers.com/products2.htm

Second link from google.
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