I recently purchased a Tac-One, and one thing I'd like to add is a barrel kit. I'm leaning towards the J&J Edge kit, but I'm wondering what size I have now and if it is compatible with the Edge Kit. For instance, I wouldn't want two of the same fronts, so I need to know if the front I have now will thread to the control bore backs in the kit.
Also, I'm not entirely sure what size I have. J&J lists a 10", 12", and 14". I've also seen an 8" and 16" on a few online stores (but they don't seem to be listed on J&J's website: http://www.jjperformance.com/main.html
For reference, here are some picts of what came with my TAC:


As you can see, the overall length is close to 11.5". Are barrels not measured from end to end, or is there some other method?
Thanks in advance.
Also, I'm not entirely sure what size I have. J&J lists a 10", 12", and 14". I've also seen an 8" and 16" on a few online stores (but they don't seem to be listed on J&J's website: http://www.jjperformance.com/main.html
For reference, here are some picts of what came with my TAC:


As you can see, the overall length is close to 11.5". Are barrels not measured from end to end, or is there some other method?
Thanks in advance.

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