FX barrels

What lamarkeiko said. I can also tell you that an impact 700 mm barrel measures 29.5" from breach to the end of the threaded adapter on the shroud so its 2.5" longer than the listed length when you include the shroud. I dont have my crown mk2 at work with me but my guess is the length of the shroud past the liner is probably the same and should be 2.5" longer than the listed liner length. Remember thats just the shroud and threaded end not with the fx moderator or anything attached to the end of the shroud.