I couldn't have gotten to where I am without taking the road I took.
I have always had ARs but only got really interested in them in the last year or so. I read the forums, fingered some gear, and decided to build two rifles with the top two manufacturers of each type of gear. This way I could make up my own mind as to what gear worked for me. So if one rifle had a Larue rail, the other had DD, if one had an M4 barrel, the other had an A1, etc. I'll try and post pics of the two after the hollidays. I had already tried running a 16" HBAR and a 20" A1 and knew that neither of those fit my needs.
What I figured out is what works for me, for now. That may change based on the kind of shooting I do in the future, but for now, for the competitions I shoot and the defensive role I envision for the gun(s), this is what works for me.
1)
Start with a Colt 6520.
Change out the upper receiver for a Colt M4 flattop.
Shave stock FSB and install Daniel Defense 9.0 forend.
Install Vltor stock over factory receiver extension.
Install Tango Down pistol grip.
Install Troy flipup front and rear BIUS.
Install Surefire light with Larue throwlever mount.
Install Aimpoint ML2 in Larue mount as well as interchanging with mini ACOG in Larue mount.
2)
Start with a second Colt 6520.
Install Colt M4 handguards.
Install A1 pistol grip and gapper.
2 is the backup/loaner for 1. I don't need anything else.