I have a custom Ultra light Ar-15 for sale.
The goal of this build was to create a rifle with <1/2MOA as light as possible while not using parts of questionable durability.
No plastic receivers. No whippy pencil barrels. That goal was achieved and now I am moving on to try and do it in the AR-10 platform.
This rifle weighs a shocking 5lb 7.8oz unloaded and has proven 1/2MOA capable with handloads. Price is $3,000 + Actual shipping.

Here is a complete build list:
Upper - 2A Balios Lite
Lower - 2A Balios Lite
Barrel - Proof research 16" 1/7 twist 1/2x28 thread
Gas Block - SLR Sentry 6 Titanium adjustable
BCG - Aim TiX titanium BCG
CH - PRI Gasbuster
Gas Tube  - Larue Gas tube
Handguard - 15" BCM KMR
Eject Port Door - V7 Lightweight
Muzzle Device - Rugged Suppressors three prong Mount
Barrel Nut - V7 lightweight nut
Port Door Rod - V7 Lightweight
Stock - MFT Minimalist
Pistol Grip - Magpul K
Grip Screw - V7 Lightweight
Trigger - Velocity Single Stage
Trigger Pins - KNS Pins
Buffer Tube - V7 Lightweight Carbine
Castle Nut - V7 Lightweight
Endplate - V7 Lightweight
Buffer - JP Silent Capture spring
Detent - V7 Lightweight
Takedown pins - V7 Lightweight
Safety - V7 Lightweight
Mag Release - V7 Lightweight
Bolt Catch - V7 lightweight

Is this still available?

Yes it is