I was looking at the .308 Predator and it says it has a 18 inch barrel in the specs - is that a misprint?
No, but don't let that deter you. Mine runs about 50 fps slower than my 22" 308's. Not enough to matter. I screwed on a flash hider that adds about 2" to it and helps balance out the looks. If someone were to put a can on one the shorter length is a good thing.