Shorter barrel and rail saves weight without affecting reliability. I don't know if the velocity loss from 16" to 14.5" would matter to you.
You can go too far, of course - my lightest AR is a pistol with a 11.3" barrel and 10" ALG rail (no optics, no light, no FA or port door and KAK blade stock). It has a "full auto" BCG and H2 buffer. It's reliable and under 6 lbs unloaded.
Last edited by AndyLate; 09-22-19 at 11:01.
Barrel.
I just threw together a 16 lightweight profile Sionics with a 13 KMR with BCM furniture and it was 6lb 4oz. Nice gun and super handy.
Thread responses really touched on almost everything. You could start throwing money at Ti parts, but I don't think it's worth it. A Micro RDS in a lightweight mount is going to save you some weight unless having just fixed irons is your thing (no carry handle). Forgoing BUIS will also save on weight. Lights and lasers are going to add up quick. Keep all spare parts and batteries out/off the gun.
Oh, and you COULD go to a LW action system but you really need to get the gas and ammo dialed in. Again, how much ROI are you looking for? Full-sized carbine, sub 6lbs for $2200-ish+?
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