I've built 2 now. I may build 2 more a standard 20" barreled clone of the M16A2 and a 9mm carbine.
#1 National Match RRA upper, LPK, stock and a CMMG inc lower. Has some crazy 2-stage trigger, Gizzel? Total cost $1168. hand gurad and but stock weights free, assembly free by USMC Match Armorer. Retail from RRA (before trigger and weights) $1125 Aproximate retail value est $1500 unfired - Wifes Gun, It has been used and shoots under 1 MOA @800 yards, been pushed to 1000 yards and hits black every time.
#2 RRA Entry Tactical 16" upper, 6 pos collapsable stock, LPK and a CMMG inc lower, assembly free. Total cost $851, retail $975 didn't really save much, the RRA rifle comes with a hogue grip.
The only reason I build my own AR's was do to my inability to purchase exactly what I wanted in the state I am currently 'stationed in' and was haveing alot of heart ache trying to order the rifle my wife wanted and then purchase it in the neighboring state. So to get what I wanted I had to build my own; due to California law not allowing 'Black Guns' to be sold throught a CA FFL. Being active duty military, I became part of a loop hole in CA law. To own the AR-15's I had to purchase the lowers out of state or own them prior to moveing to CA, Register them on my duty station, once Base registration was accomplished, I fell into a 'gray area' of the law. I needed to get the CA DOJ 'dangerous weapons permit' to be 100% legal (yes it is really called a 'dangerous weapons permit) after getting the permit I could begin buying the parts and removeing the recievers from my home lawfully. If it weren't for Commy Californias gun laws I would have just ordered the rifles dirrectly from RRA.
I don't see that we saved alot of money by building our own, There's only one thing I would have changed by building the rifles, I would have tried harder to purchase RRA lowers so that the rifles were 100% RRA and not 'mis-matched'. The NM rifle is a really tight rifle build for precision, I don't see useing used parts on a rifle of that level.
My Entry Tactical was bought over a few months, so the cost of the rifle was spread out, makeing the hard ship off buying all new hard ware less of a strain. I did run across several military surplus 16" uppers, for around $300, some 10.5" with fixed 5.5" flass hiders for $250, a 4 position stock could have been had for $35 and a LPK could have been had for $55... I like knowing that everything I have is brand new.
If there are any other Active Duty Military Members resideing in CA, send me a message and I'll give you the phone number, and womans name to talk to about obtaining your permit to 'legaly' have semi automatic rifles that the state of CA has banned from sale or you just have brought them to the state and have stashed them in the closet because you were told they were illegal w/o exception. Permit has a one time fee of $78, and an annual renewal that will cost a few stamps.