Regarding the barrels, there are a number of versions of the 1:7 twist barrels out there, some marked (nato trials iirc) and some have the same civilian markings as the stock 1:10s. Not 100% on this info, but that is my understanding.
The two photos below show the 1:7 twist (a Nato trial version) compared to the standard 1:10s most come with (top one in the photo being the 1:7).
-The flash eliminator on both are machined as part of the barrel.(as mentioned)
-The inside of the 1:7 barrel is threaded, the 1:10 is not.
-In addition to the threading, the Nato barrel has a slightly longer flash eliminator. (now, as these are machined as part of the barrel, I have seen slight variation in design and size going from the 14" nominal and 20" nom. barrels. - so I'm not sure this is a truism. The other thing to consider is their point of manufacture. I don't have enough info on that, but I have heard that all of their barrels are not manufactured in the same place. Someone like James B. of CIE should weigh in with his knowledge on the subject).
-The different bayonet lugs can be seen with the Swiss one being on the civilian barrel and the Nato lug on the 1:7.