I might be wrong, I think I heard on the AEAC vlog if you 700 m barrel is meant for only the Crown Continuum (CC) series of the Crown. On the CC the barrels lock into the receiver with 4 “locking screws” vs. 2 as seen in the regular crown. Part of the reason for the 4 screws is to provide additional support needed to secure the 700 mm barrel into the receiver. I don’t know if this is the same set up as in the Dreamline and will work in the Dreamline. I am waiting on receiving my CC in .22 cal so I am trying to learn what I can about the gun.