i have the 14" j&j ceramic and its awesome. the self cleaning feature is nice too. i would think that as long as its the standard j&j ceramic (not the 2 piece, and not the one with the tapered end) a shroud should fit it, but the barrel is not completely straight. it flares out a little at both ends. the best thing to do would probably be to contact the company you are thinking about getting the shroud from, and ask if it will fit the j&j. they should know if it will fit.

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Tippmann A-5 "Tweek"; 14" J&J Ceramic, polished internals.