Rifled choks for shotguns

As has been pointed out a single trigger is semi automatic in so far as it goes I guess, as it fires one cartridge with each consecutive pull of the trigger. There may be a carve out in the law though
No. It requires that the fired cartridge be ejected by gas or recoil energy. Elsewise any modern O/U shotgun would be s1.
 
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The Paradox choke wasn’t designed to disperse shot at short distance.

It was designed to fire a solid bullet accurately but without disrupting (i.e. unduly spreading) the shot pattern. In this it largely succeeded.

Whilst the 1885 Fosbery Paradox patent was in force companies such as Greener tried fully rifled barrels with various forms of recessed chokes (all of which was outside of the scope of the patent) but it was found that whilst the results with ball were good the shot patterns were ‘spoiled’ (i.e. spread).


Not according to Beretta
 
In order to summarise my thoughts on the OP:

I imagine that rifled chokes as a thing of themselves may be lawfully possessed in the UK, in the same way an unchambered barrel is not a controlled item.

I'd further imagine that thy could be fitted to a non-pump, non-self-loading gun by someone with authority to possess a rifle in whatever bore the 'gun' is - since fitting the rifled choke would presumably turn it into a rifle.

How does that sound?
 
In order to summarise my thoughts on the OP:

I imagine that rifled chokes as a thing of themselves may be lawfully possessed in the UK, in the same way an unchambered barrel is not a controlled item.

I'd further imagine that thy could be fitted to a non-pump, non-self-loading gun by someone with authority to possess a rifle in whatever bore the 'gun' is - since fitting the rifled choke would presumably turn it into a rifle.

How does that sound?
Ah. This is where it gets interesting. The "de facto" as in how the law is interpreted seems to be as you've well put in certain aspects.

That is if the "accessory" is fitted to a s5 it becomes s5 and it becomes s1 if fitted to a s1. The best "logic" regarding this in respect of s1 is that a .22 moderator on an air rifle is PRESENTLY in England and Wales not controlled but if the same moderator is fitted to a s1 .22LR bolt action it's taken to be s1.

Other than that it's all "he said, she said" in that as far as I know there's never been a court case here where a person has fitted a removable rifled choke to a s2 pump action or self-loading shotgun and then had the authorities prosecute them. So AFAIK there's no case law notwithstanding what the Memorandum of Guidance says about rifled chokes.
 
As has been pointed out a single trigger is semi automatic in so far as it goes I guess, as it fires one cartridge with each consecutive pull of the trigger. There may be a carve out in the law though
Same barrel as well, so even a double barrel with single trigger isn't, I get where you're coming from though
 
The way the Firearms Act is written:

Section 1 describes all guns being subject to a Firearms Certificate with three major exceptions:

Section 2: which defines Shotguns as having smooth bores of a minimum of 24”. If it is fitted with a magazine it must be unable to hold more than two cartridges

Exempt guns - powered by air with max muzzle energy of 12 ft lbs or 6 in the case of a pistol, or obsolete held as curios

Section 5: Prohibited guns - self loading semi and fully automatic, short overall length and barrel length etc - handguns are prohibited by their short length.

A rifled choke on a shotgun means that it is no longer smooth bored and thus is no longer legally defined as a “shotgun”.

“Paradox”, “Explora” etc were attempts by British makers, and others to give greater accuracy with a sporting gun that could fire both shot and a solid bullet. In the 1880s / 90’s there was still a view that big slow moving lumps of lead where the way forward.

Then along came rifles 7x57, 303s etc using smokeless powder at a small 170 odd grain bullet at 2,400 plus fps and they were very very much better at killing game especially at anything beyond 50 yards.

Most British gentlemen/ pioneers went with a shotgun and a rifle (which doubled as their military rufle) to the colonies.

Germans went down the route of combination guns combining a shot and a rifled barrel.
 
I had a rifled chocke tube for my 20" slug barrel on my 870 wing master. Made no difference to the accuracy with rifled slugs over a open choke. It may work better with sabot slugs.
 
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I wonder if there has been high speed filming to show how much actual spin one of these rifles chokes imparts on a slug?
 
“Paradox”, “Explora” etc were attempts by British makers, and others to give greater accuracy with a sporting gun that could fire both shot and a solid bullet. In the 1880s / 90’s there was still a view that big slow moving lumps of lead where the way forward.
And the "Colindian" as below:


These were all, mostly, attempts for a gun that could be used as a shotgun yet have the capability to take large or medium cloven footed game that required a slug to either kill or kill at distance. An attempt to allow the man going after a bird for the pot to take larger quarry.

The idea being that in India which was the main market for these things you'd go out for duck or whatever else winged game was about bit of you saw deer or larger then you could open the gun, load two "ball" or "bullet" and be able to kill it.

So they weren't as such a poor man's double rifle (although could be used as would have been in the 1880s/90s an old school blackpowder breechloading 12 bore double rifle) but rather an attempt to give better accuracy at distance in a "shotgun" type weapon (with a specially designed projectile) than a mere smoothbore shotgun would firing a simple round ball.

The book "With Gun, Rifle and Hound" by "Snaffles" mentions them. By the time of smokeless metallic small bore (as in at that time anything under .400 or so) rifles they had seemingly become less popular as had the old school 12 bore double rifles.
 
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