I have been building AR 15s and AR308s lately. My AR 15 with 16.1 inch 6.8 SPC II barrel weighs 3.5 pounds. Just about every part has been replaced with titanium parts of higher quality.

I love my Savage 10TR, but I am building an AR 308 with fluted 18 inch barrel that will weigh about 5.3 pounds.

A while ago I built a custom Savage in 6.8 SPC II, about 6 pounds and shoots bug holes.

But as of last year you could only get R 700 receivers in titanium for $$$$$$$

Don't really want a Savage titanium receiver, but almost everything in the 13 ounce bolt assembly could be made in titanium. So the BOLT ASSY SCREW, REAR BAFFLE ASSY, COCKING PIECE PIN, BOLT BODY RH, BOLT BODY LH, BOLT HEAD RET PIN, FRONT BAFFLE SHORT ACTION, FIRING PIN

The cocking piece sleeve, springs and the bolt head would remain Savage steel.

I figure these titanium parts would cut at least 4 ounces and perhaps 6 ounces.