i was looking into purchasing a harris bipod for my 16 inch ar15 and was torn between getting the l model which adjusts 9 to 13 inches or the benchrest model 6 to 9 inches. my questuion is I'll be doing mostly 100 to 200yrd shoots with this rifle in a prone poistion in your opionion/experiences would I need a bipod more than 9inches tall. right now i have a busnell trophy red dot sight with 1/2 risers off my a3 rail putting the dot with a perfect cowitness with the factoty front sight post