I don’t even know what an FAL weighs but it always struck me as a trim little rifle. The HK-91 looks like it would weigh more to me but like I said, I don’t know for sure.
I owned an FN M-1949 in 7mm Mauser for a few years. I actually ordered it through the mail from J.C. Penney. Imagine that! It was pretty stocky looking and very similar in operation to the FAL except it had a wood stock and stripped differently.
I don’t recall the weight bothering me at all.
The FAL and the HKs both weigh in around 9 lbs, dry.
Add a fully loaded 20 round magazine, you just added another pound and a half. Then there's the scope and sling . . . .
I think I'll just carry my little Ruger M-77 . . . .