Thanks Minnesota, and thanks Brasscow. Jeff I have not gotten time to shoot my 3-18 yet, because I deployed. But for its size it is light, and allows me to reach with the .308. Once I have both projects completely finished I am going to post a thread. But The rifles look like this:
.308 (rifle without scope/mount and Gemtech Sandstorm suppressor is coming in a 7.25 lbs right now)
MEGA MATEN set
PROOF 18in barrel w/Gemtech Titanium Sandstorm
JP low mass bolt
JP trigger
Lancer Systems 15 in Carbon Handguard
ACE ultra lite stock (the one that is nothing but a a little piece of rubber hanging off the buffer tube)
syrac adjustable
.223 (This rifle is not built but without optics and Gemtech Trek-T suppressor will be somewhere between low 4 to mid 4 lb mark)
MAG Tactical upper/lower
PROOF 14.5 barrel
JP Trigger
Mission first 6 ounce stock
SLR adjustable gas
V7 weaponry lightweight components (which by the way, if you do not know about Joel and V7, you are behind

V7 lightweight 6 pos adjustable buffer tube
BOOMFAB titanium bolt
I do not have a hand guard yet, but it will be a BCM KMR of something lighter if V7 comes out with some new surprises.
It has been fun doing these two builds.