From a good photo of profile, I've esteemed that it protrudes from the shield of about 4830 mm, but I have not checked the protrusion of the shorter version to compare it. Besides I don't know where is the internal point, on the photo, from which the length of 62x105=6510 mm should start.
Anyway the additional module of the thermal sleeve (3 present in front of the fume evacuator) seems long between 1050 and 1120 mm, that would be consistent enough with a difference in length of the barrel of 1050 mm, supposing that the first and second module are identical to those of the ZPL-83A.
Seems enough for my modelling purpose.