FYI, the Styer AUg should not have the barrel chopped- it runs on a narrow gas envelope and it seems to have issues with the barrel being chopped (as mentioned, gas ports were drilled at a 45 degree angle on the 14.5" abrrels)
The Tavor should be OK- the standard CTAR Tavor has a 15" barrel, and as I recall the X95 has a 13" barrel and uses the same gas system, so in theory you should be good to go.
Of course, the best bet is simply to call IWI US and ask them.