You can find an Apex for about any barrel on Ebay. You can also find them on other forums. It really does not matter what threads they are because you are just using the tip. The tip is the same no matter what the threads. Buy the cheapest Apex barrel that you can find and then get the adaptor. Take apart the tip and put it on any barrel you want. Just make sure that your adaptor will fit the barrel you are putting it on.

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"A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort." - Herm Albright