mkay? so 40Arpent stands up and and introduces himself/horseflesh as the ashpole in the thread. I don't know you, nor do I care to know you. OP asked a question. I'm sure the OP appreciates Technical replies vs smart ass comments
Personally, 20" AR platform for me is plenty, 18" is just right. I built an 18" platform for my 3-gun role.
I was actually being sincere, but you can go **** yourself anyway.