I am thinking of buying a bushy M4, in this field, I have zero knowledge . Could any of you AR gurus kindly enlightened me which is better the 14.5" or the 16" barrel. What's the difference between the Hbar and LBar. Which do you guys prefer the A2 or the A3. Thanks in advance to any advice you'll chime in. And Oh, by the way , what's the best scope you'll recommend to get just in case that I'll go for the A3.