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Old July 10, 2011, 08:32 PM   #2
zippy13
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Join Date: August 23, 2008
Location: SoCal
Posts: 6,408
Before screw-in chokes, adjustable chokes were popular on pumps and auto-loaders. If you consider the manufacturing process of a shotgun barrel, it obvious that having the adjustable choke as an integral part of the barrel would be a major bother. If you look at your second pic, there seems to be a joint between the barrel and the choke. The easiest/cheapest way to attach a choke at the factory is by sweating it on (soldering). I'm assuming this is a factory choke.

That being said, look at the porting cuts, you'll see that your gun has a relatively thick barrel. Your choke might be an after market screw-on; but, most screw-on devices have flats, or other means, to accommodate the attachment tool. I don't see any on your gun's choke base. I'm still guessing it's a solder job.
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