Inerta operated shotguns.

Did a quick Google and someone claimed Benelli was the one who has the patent for the design.
HK had a version too and was mentioned in the forum i stumbled upon.
w w w dot luckygunner.com/lounge/gas-vs-inertia-shotguns/
Rob
 
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Huh, learn something new everyday. I thought inertia guns and long recoil were the same. Silly me.
Inertia operation in modern shotguns used to be unique to the Benelli line of guns. However, since Beretta now owns Benelli as well as Franchi and Stoeger, there are actually more than a handful of inertia operated shotguns available, and these come in at a variety of price ranges as well. Technically, inertia operation is a type of recoil operation like the short-recoil system normally utilized by handguns and the long-recoil operation that ruled the world of semi-auto shotguns before gas operation was implemented. It uses the recoil of the shotgun to complete the loading cycle, but in a much more interesting way than simply having the impulse from the shell drive the bolt backwards directly.

Inertia operation involves a bolt carrier and inertia spring that are not rigidly fixed to the rest of the gun. When the gun is fired, the recoil pushes the gun backwards against the inertia spring and bolt carrier that are effectively floating in space inside the receiver. This rapid recoil impulse hits hard enough and fast enough to compress the inertia spring about 4mm, but because the spring is so incredibly stiff it’s still able to store enough energy to send the bolt flying backwards where it will compress the return spring while extracting the spent shell and re-cocking the hammer. It sounds complex, but the main concept is more or less the same thing as hitting a big rubber ball with a baseball bat. The ball compresses before it is able to move and then is launched away as it springs back to shape.
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http://www.luckygunner.com/lounge/gas-vs-inertia-shotguns/
 
Blastattack said:
The Browning Auto 5 is not an inertia gun. It is long recoil and completely different in every way from Stoegers inertia guns.
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You are correct. Long recoil and inertia are not the same thing when discussing a shotgun action but like "clip and magazine" the terms are often used incorrectly.

Here's a good explanation of the differences among long recoil, short recoil and inertia.

https://en.wikipedia.org/wiki/Recoil_operation
 
the spank said:
What do you think moves the barrel and bolt assembly?? A ####ing winch and cable? f:P:
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Inertia guns work on a very simple principle and is based solely upon Newton's first law; the law of inertia. It can be summarized as: "An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force."

Inertia guns function on this principle. Most (if not all) inertia guns operate using a rotating bolt head coupled to a bolt body, with a spring in between them. The bolt body in an inertia gun is "free floating", and is is allowed to move under recoil. When the firearm is discharged, it creates a recoil impulse, or a rearward force. In this system, everything except the bolt body is forced to the rear. The mass of the bolt creates inertia, which is a stationary force, which then compresses the spring between the bolt body and the bolt head. When a spring is compressed it stores potential energy, and when that potential energy is greater than the inertia of the bolt, it causes the spring to release it's stored energy and bolt the bolt body away from the bolt head, unlocking and cycling the action. This is why inertia shotguns (and any inertia based firearm) can be very sensitive to ammunition, especially light loads. Light loads do not generate enough recoil to adequately compress the spring before overcoming the inertia of the bolt. This is why when one purchases a Benelli (or any variant of the system), they must be relatively sure of what it's intended purpose is. The 3.5" hunting guns to not always play well with light target loads.

Browning's Long Recoil system does not rely directly on the inertia principle. When the gun is discharged, the bolt is securely locked to the barrel via a wedge system and the recoil impulse drives both of them back into the rear of the receiver. When the bolt and barrel arrive at the rear of the receiver, the locking block is permitted to disengage, the bolt is held back and the barrel returns to the firing position. Auto 5s are just as susceptible to ammunition changes as the Benelli system, but adjustments to lubrication and configuration of the friction ring assembly allow the gun to be readily adapted for different ammunition types.
 
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Blastattack said:
It sure as hell isn't inertia you knob. You don't even know what inertia is, do you? Let's school you then.

Inertia guns work on a very simple principle and is based solely upon Newton's first law; the law of inertia. It can be summarized as: "An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force."

Inertia guns function on this principle. Most (if not all) inertia guns operate using a rotating bolt head coupled to a bolt body, with a spring in between them. The bolt body in an inertia gun is "free floating", and is is allowed to move under recoil. When the firearm is discharged, it creates a recoil impulse, or a rearward force. In this system, everything except the bolt body is forced to the rear. The mass of the bolt creates inertia, which is a stationary force, which then compresses the spring between the bolt body and the bolt head. When a spring is compressed it stores potential energy, and when that potential energy is greater than the inertia of the bolt, it causes the spring to release it's stored energy and bolt the bolt body away from the bolt head, unlocking and cycling the action. This is why inertia shotguns (and any inertia based firearm) can be very sensitive to ammunition, especially light loads. Light loads do not generate enough recoil to adequately compress the spring before overcoming the inertia of the bolt. This is why when one purchases a Benelli (or any variant of the system), they must be relatively sure of what it's intended purpose is. The 3.5" hunting guns to not always play well with light target loads.

Browning's Long Recoil system does not rely directly on the inertia principle. When the gun is discharged, the bolt is securely locked to the barrel via a wedge system and the recoil impulse drives both of them back into the rear of the receiver. When the bolt and barrel arrive at the rear of the receiver, the locking block is permitted to disengage, the bolt is held back and the barrel returns to the firing position. Auto 5s are just as susceptible to ammunition changes as the Benelli system, but adjustments to lubrication and configuration of the friction ring assembly allow the gun to be readily adapted for different ammunition types.
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In other words the same forces work to function the cycling of the gun just by a different design.....
 
the spank said:
In other words the same forces work to function the cycling of the gun just by a different design.....
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It is picking the pepper out of the fly poop to get picky about the differences among inertia, long recoil and short recoil as all three use the impulse from the fired shell to work the action while a gas gun uses the gases discharged from the firing the cartridge.

jpbcal308 said:
What about the Browning A500 recoil operated not gas ?
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It's a "short recoil" gun as is the current production A5 and their "Kinematic Drive" action.

How the A500 operates is described in this link

http://www.browning.com/content/dam/browning/support/owners-manuals/a500-om-s.pdf
 
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