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Old 01-30-2013, 03:20 AM   #1
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Is there a way to tell, by photo, if a gun is locked breech or blowback etc?

At the risk of over simplifying and sounding stupid, can it be as simple as identifying if it has a floating barrel or fixed?

I mean, if you can see a picture of the slide racked and locked back and notice that the barrel tip is angled upward, would that not indicate locked breech.

And visa versa if barrel parallel to frame indicating fixed, thus blowback?



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Old 01-30-2013, 10:36 AM   #2
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One way is to look how the barrel is in relation to the slide when close.
Most blow backs do not allow the rear portion of the barrel to mesh or engage the slide.

The "pocket" pistols could be an example. The Kel-Tec P3AT has a barrel that the rear is flush with the top of the slide. As the slide retracts, the rear of the barrel cams down.

The PPK (blow back) barrel does not cam down.

When the slide is retracted, any movement of the barrel indicates that the firearm is not a blow back.



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Old 01-30-2013, 12:38 PM   #3
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There are always exceptions. The beretta 92 and its kin are direct blowback, the only 9mm handgun i know of that is such, but the barrel disengaging the slide is delayed. Its what makes their cyclic rate so blindingly fast.

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Old 01-30-2013, 12:48 PM   #4
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The M9 is a bit of a weird duck, but is actually recoil/ blowback, with a locked breech. From the FM on the M9-

"Blowback reaction generated by the exploding charge thrusts the locked barrel/slide system rearward against the recoil spring. After recoiling about 3 mm (1/8"), the barrel and slide unlock, allowing the barrel to tilt down into the locked position. The slide continues rearward until it abuts against the receiver stop."

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Old 01-30-2013, 03:50 PM   #5
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Quote:
Originally Posted by c3shooter View Post
The M9 is a bit of a weird duck, but is actually recoil/ blowback, with a locked breech. From the FM on the M9-

"Blowback reaction generated by the exploding charge thrusts the locked barrel/slide system rearward against the recoil spring. After recoiling about 3 mm (1/8"), the barrel and slide unlock, allowing the barrel to tilt down into the locked position. The slide continues rearward until it abuts against the receiver stop."
Isn't that just how most locked breech handguns fire?
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Old 01-30-2013, 04:14 PM   #6
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Quote:
Originally Posted by JonM View Post
There are always exceptions. The beretta 92 and its kin are direct blowback, the only 9mm handgun i know of that is such, but the barrel disengaging the slide is delayed. Its what makes their cyclic rate so blindingly fast.
The H&K PSP P7, and variants, are fixed barreled, blow back, 9mms.
The delay in slide retraction is done by the gases bled off the cartridge.

The Hi-Point 9mm and .45ACP are of the blow back design.
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Old 01-30-2013, 06:04 PM   #7
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Quote:
Originally Posted by danf_fl View Post
One way is to look how the barrel is in relation to the slide when close.
Most blow backs do not allow the rear portion of the barrel to mesh or engage the slide.
Okay, that's an interesting and logical sounding way to think about/look at it.

Let me see if I understand correctly. If, when looking at a semiautomatic pistol on the right side with shell ejection port, the top of the barrel, which is visible through the porthole, isn't flush with the slide, it's quite possibly, if not most likely, blowback?

So like my Firestars, where the barrels are completely shrouded by the slide, are probably blowback operated?

Picture of guns found here for reference...
http://world.guns.ru/handguns/hg/sp/star-firestar-e.html

Thanks Dan!
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Old 01-30-2013, 06:08 PM   #8
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Quote:
Originally Posted by JonM View Post
There are always exceptions. The beretta 92 and its kin are direct blowback, the only 9mm handgun i know of that is such, but the barrel disengaging the slide is delayed. Its what makes their cyclic rate so blindingly fast.
Very interesting. It's the any simple way to explain how they achieve our even why they would incorporate such a system?

Do you have a preference in these actions by the way? And if so, would you mind briefly telling me why.

I've been under the assumption that locked breech was the most reliable, but that was an uneducated guess and I wish to get educated.
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Old 01-30-2013, 06:46 PM   #9
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Quote:
Originally Posted by BeyondTheBox View Post
Okay, that's an interesting and logical sounding way to think about/look at it.

Let me see if I understand correctly. If, when looking at a semiautomatic pistol on the right side with shell ejection port, the top of the barrel, which is visible through the porthole, isn't flush with the slide, it's quite possibly, if not most likely, blowback?

So like my Firestars, where the barrels are completely shrouded by the slide, are probably blowback operated?

Picture of guns found here for reference...
http://world.guns.ru/handguns/hg/sp/star-firestar-e.html

Thanks Dan!
I read the tech info and it says that those firearms in your reference are cam operated. The barrel looks to be like a blow back, but in reality, they have 1 or more lugs or some part of the barrel that engages the slide.
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Old 01-30-2013, 06:54 PM   #10
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Quote:
Originally Posted by danf_fl View Post

I read the tech info and it says that those firearms in your reference are cam operated. The barrel looks to be like a blow back, but in reality, they have 1 or more lugs or some part of the barrel that engages the slide.
Yeah, that's why I asked. It says it uses some Browning cam locking system or something like that right?

So am I safe to assume this "cam locking" is the same as a breech lock action?

Maybe there simply is no way to tell by pictures. Lol

Thanks again for the consultation Dan!


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