Although I combed the Sig forum threads, I could not get verification regarding TACPAC and TACOPS. I finally got email verification that railed XO pistol in TACPAC is indeed same as TACOPS without the night sights, ambi-safety and magwell.bds said:I found some confusion about this package. TACPAC (Tactical Package) is not to be confused with TACOPS (Tactical Operations) which comes with ambi-safety, mag well, night sights and optional threaded barrel. TACPAC comes with Nitron pistol without the ambi-safety, without the magwell and 3-dot sights.