From what I can see the TR and the FCP-SR are threaded, TR is 20" the FCP can be 20" or 24". FCP comes with 10 round magazine. New FCP does not readily accept AICS style mags like the previous version. 10T is the exclusive, 24" non-threaded barrel. I believe the TR is discontinued, but I may be wrong. I am planning on getting the 10T, it goes on sale this Thursday, $70 off.
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