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Old June 8, 2001, 12:44 PM   #1
rock_jock
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Specifically, blowback-operated and recoil-operated.

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rock
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Old June 8, 2001, 01:13 PM   #2
Destructo6
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None. They are the same. Did you have any specific examples in mind?
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Old June 8, 2001, 01:36 PM   #3
DAVID NANCARROW
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Blowback systems, such as a PPK, use a fixed barrel an either a heavy slide/weak recoil spring or heavy spring/light slide. The only 'lock-up' is the weight of the slide or spring tension to slow up the reciprocating part, allowing the bullet to exit the barrel and allow gas pressure to drop to a safe level before the slide pulls the fired case out of the chamber.

Recoil systems, such as the 1911 or modifications thereof, use barrel/slide lugs and recoil springs to physically lock the barrel and slide together long enough for the bullet to exit the barrel, and gas pressure to drop to a safe level before they disconnect. The Beretta Cougar uses a rotating barrel, rather than a dropping barrel to accomplish the same thing.
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Old June 8, 2001, 01:58 PM   #4
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The M3 "Grease Gun" is an example of a blow back system, as are most .22 handguns. Also the 1945 model Thompson SMG. (Most SMGs, actually.)

The M2 heavy MG (.50 cal) is an example of a recoil operated system. The recoil of the barrel drives the action.

Washignton D.C. is an example of a gas operated system. (hot air)



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Old June 8, 2001, 05:12 PM   #5
rock_jock
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These explanations make a lot of sense. So, I guess in a blawback system it is not advisable to change the spring tension/slide weights around too much lees you blow up your gun.
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Old June 8, 2001, 05:41 PM   #6
bad_dad_brad
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Left Out

One thing left out in this discussion. Blowback pistols are .380 caliber and under. They can't handle anything more powerful. Physics dictates that a more powerful cartridge would need a more massive slide and stiffer recoil spring to work properly as you need that resistance of the mass of the slide and stored energy in the recoil spring to have enough gas pressure to send the bullet on it's way. Not practical for a pistol. Okay for a cheap sub-machine gun though (like the M3).

The recoil lock-up system (most are Browning design) as indicated in the previous posts, locks the barrel to the slide until the bullet leaves the barrel, thereby creating the proper level of gas pressure to make the round effective.

All recoil systems have cartridge extractors. Most but some blowbacks do not.



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Old June 8, 2001, 09:48 PM   #7
teufelmann55
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Definitions

I have the military definitions and I posted them on a topic in smithy awhile back about accidental discharges due to dropping a 1911-If you want them I will give them out again
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Old June 8, 2001, 10:31 PM   #8
Zander
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"Blowback pistols are .380 caliber and under. They can't handle anything more powerful."

Ummm...no, that's not correct.

There are lots of blowback designs in 9mmP and .45ACP for instance.

Some of them approximate a brick, but they do exist.
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