That's all fine, but it turns out SIG lists what I call a chicken-hopper tank as "Profile Uniflo Combat Tanks," leading to some confusion.
Further, the appropriate SIG part numbers are GRW325C for the 3.25-ounce chicken hopper, larger sizes are GRW375C, GRW425C, GRW5125C, GRW575C.
The 3.25-ounce tank is a mere 2.25 inches long, making it a comfortable fit on even the short-nosed FSs. In conjunction with something like a 25FP it gives enduro-type runs and short-tanking is a frequently used option.
My experience with two of these tanks has been completely positive; they are the best answer I know of for tanks that work properly while also fitting the nose of a Flite Streak.
Dan
Steve