Wow, Ive been away from FTF for 5 months. Im sorry. Glad im back. Anyways, I think its time for my first AR. Served in Iraq with the Corps with an issued A2. Because of this I have some certain preferences I cant kick. First of which is I want a 20" barrel. But, instead of an A2, I want to build an M16A4 clone or A4gery. I still want the longer barrel, but I want the removable rear sight housing group (we dont use handles in the Marines). I would also like to keep it a Colt. I am thinking the Colt MT6700 would be the best platform to work off of. I tried doing some simple google searches and cant find it. So Im seeing if you guys have any info on where I should try and look to find one.