You used nice stuf but that has to be one of the most riduculously front heavy carbines you could have built. The only thing you could have done to make it more front heavy was use a HBAR barrel.
You have
Heaviest light/grip combo made
Heaviest forearm available (SIR)
Heaviest EOtech mounted directly over the hand guards.
Heaviest barrel profile (HBAR)
You sure that barrel is 14.5"?... it looks 16" with a standard A2. SWEET JESUS that thing must want to do a front flip. LOL
I would HIGHLY suggest you look in a Magpul stock to help balance out the weight a bit better. That thing looks like it would be a bitch to do tac reloads with from a magpouch while holding the weapon up in the ready position with one hand.
I think the individual parts are all top notch... just the opposite of what I spent a fortune to undo. I hate front heavy carbines. I used to have an HBAR and sold it... later wanted a SIR, tried it and got KAC and M900, still too front heavy even with 14.5" govt progile barrel, sold it. Got a DD rail and it was STILL too heavy with the M900. Sold that. Now I have resorted to a 11.5" carbon fiber barrel and Gladius and KAC forwrd grip to reduce weight on the front end. Well I just bought a new suppressor so now I am all the way back where I started plus some.
I think if you get a suppressor and NV eventually and get a IR laser you will be rebuilding that puppy with a barrel light under the handguards (or having that one turned down) and getting a lighter rail that will allow you to mount teh EOtech further to the rear.