What I see many guys do it take the front end off and then use an appropriate sized gun case or suit case to transport the two pieces on the place.
A couple bolts reinstalled and you're ready to go.
This link from a past Excal forum contains both a discussion on this AND a couple pictures:
Bulldog 400, Hawke XB30, JBK string, Dr S, TriggerT
380 Blackout, XB75, DM String, Dr S, TT, ti64
405 Matrix, XBR, HAA, DM string, TT, ti64