scott
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Posts: 100
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Post by scott on Jan 29, 2014 20:20:53 GMT -5
Ebay was good to me this week! Solder on threaded choke adapter for 20ga. These things are like hens teeth! This was really the only specialty component I needed to be comfortable shortening the barrels on my 24V. since it's a solder on unit, I don't even have to worry about cutting threads. Just have to machine the outside of the barrel down and it slips right over. OD of the adapter is within a few thousandths of the barrel so after refinishing it will be nearly invisible. scott is a happy camper this evening!
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Post by captcapsize on Jan 29, 2014 20:44:54 GMT -5
Wow! I didn't know that such a thing even existed. You could peruse my previous posts on trying to get my 24 choked if you care to. This doodad that you have found, do you cut off the shotgun barrel then fit this to be the same length as the rifle? Or how does it work out?
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scott
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Posts: 100
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Post by scott on Jan 29, 2014 23:34:00 GMT -5
That's right. The front half of the adapter is the same as a threaded barrel, the back half has been bored out slightly. Fitting it involves cutting the barrel so it will be the proper length when the adapter is installed, machining down the outside of the barrel (best done on a lathe) by a few thousandths so the adapter will telescope over it, then soldering it place and refinishing the barrel. I have to measure before I know for sure, but there may be very slight machining on the inside of the adapter to match the cylinder bore of the barrel. I'm hoping that it's standard enough that the match is precise, but even if not, it's a simple operation to match them up.
It should be noted that to do the job right, one of the barrels need to be removed from the breech block, so many of the model 24's wouldn't be good candidates. Although somebody with good skills could probably do the fitting with hand tools, it would be a bear of a job.
Also, the fact that the OD of the adapter is only about .008" (this is just an eyeball estimate... the difference is almost invisible) larger than the barrel of my 24V leads me to believe that the barrel could actually be threaded for chokes, though it would be a close thing.
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scott
Frequent poster
Posts: 100
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Post by scott on Jan 29, 2014 23:41:38 GMT -5
By the way, I bought this as part of a lot. I actually have two 20ga and two 12ga adapters The 12ga adapters are still available at some of the online retailers, but apparently the 20ga ones are NLA.
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Post by captcapsize on Jan 31, 2014 10:47:15 GMT -5
This may be a perfectly stupid idea but I am wondering if it would be feasible to tap the end of the shotgun barrel to receive a screw on choke (if such a thing exists). The thought of separating the barrels is a scary proposition to me. I waited for a long time to find the .223/20 that I now have. I sure wouldn't want to mess it up.
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scott
Frequent poster
Posts: 100
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Post by scott on Jan 31, 2014 11:14:39 GMT -5
Tapping the outside of the barrel couldn't be accomplished with the barrels together. Tapping the inside could be. For something like a choke you want the threads to be concentric and it would have to be done on a lathe. With the barrels together, you'd need a 4 jaw independent chuck to hold them with the shotgun barrel centered and would need a lathe with a large enough center bore for both barrels to fit through.
The big question is whether or not the shotgun barrel is thick enough to bore and thread for a standard choke. The adapters I bought use thin wall chokes (win chokes or tru chokes)and it LOOKS as if the barrel could be threaded for them, but without a micrometer I'm not going to guarantee that's the case.
If your barrels are siamesed together, it might be possible to notch the adapter so that it fits over the barrel without taking the two of them apart, but you'd still need to take a few thousandths of metal off the outside of the barrel for the slip fit, either by hand, on a shaper if you can find someone that has one (they're pretty uncommon)or on a fancy 3d cnc machine.
If you weren't worried about cosmetics, you could make your own slip fit choke adapter that didn't require machining, but it will add a step to the barrel where the adapter slides over the barrel. A custom made barrel band that buts up against the back of the adapter was suggested to me on another forum as a way to hide the step.
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