isn't the match target the one Colt barrel that is not chrome lined? There are adapter pins for the front large take down pin. There is a straight pin with detent in the pin like an H&K take down pin. There are adapter pins that have a screw on each side but the center is offset and a smaller diameter to allow use of a small pin upper. You can buy large pin uppers. It might be just as cheap to replace your barrel and sell that one or buy / build a complete upper with a threaded barrel.
There's nothing wrong with the barrel you have. If you want a flash hider you may want a bayonet lug also.
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