Tiberius or TiPx pistols, .50 calibre pistols
Sorry to come back late - I meant the Tiberius or TiPx pistols as .68" options, and .50" pistolsGuys, sorry to disagree and correct. The Tiberius and Tippmann pistols are .68 cal.
I discounted .43" pistols (or to be honest didn't even think of mentioning them!) because like .50" they have been a bit niche but .50" has become more widely known.
.43" & .50" have suffered from sites not necessarily allowing them or ot knowing what velocity to allow, with the newer Splatmasters sites have become more familiar with .50"