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The Weaver choke was a fairly well-known device in times past, and a few still like to use them. I put them on occasionally for shooters, as well as other choke work.
The tubes are not impossible to find, but are aluminum, so not compatible with any hard shot, like steel or hevi-shot, etc.
I have and can make replacement chokes for those that want something even better, from my special choke steel. If you just want user light duty lead shot tubes, look around for a while, since there is a small amount of them floating around. The factory tubes are SKEET, 1/4, 1/2, 3/4, FULL, and XFULL, I believe. I can make any size and in between sizes if you have the need for custom size, extra strength, better fit, and higher cost than sometimes a factory tube may bring.
I would not expect factory Weaver tubes to be over $25 each or so, but you be the judge. Aluminum tubes can more easily be dinged, squeezed, or other damage that you might not notice until too late, if you found at a gun show, for instance.
The wrench is a straight bar of steel to go through the two holes in the tube, and can be fabbed from basic steel pin material.
kirbythegunsmith@hotmail.com