Thanks Colosseum! I have redone the barrel so that it is 12.7 inches in length but I have stumbled into realising the lack of a dimension on a few minute details. The handguard, while works on the 629 and the XBRN177E2, seems to be slightly too long for the 610. So, for the 610 and 629, I've shortened them slightly while having the XBRN177E2 the same. The moderator in question seems to have oddly different sizes. Wikipedia unhelpfully claims that there is 3.5 and 4.5 inch ones while also stating all military moderators are 4.25 (108mm) and 4.2 (110mm)... How they come across the numbers and conversions are beyond me.
At any rate, here're the drawings!
Any feedback is welcomed!