Wow, thats the first V2.5 that I have seen with that short of an inner barrel! Not to say that the setup isn’t valid, or anything. I am figuring on going down to a 363mm or 300mm with my M110 SASS to support some really heavy stuff.From taiwans site this version of the HK417 has a 270 mm inner barrel. So yeh will be overvolumed. For 16 inch barrels I would expect around 400mm inner barrels like the cyma and the classic army have.