I am posting this for a buddy.
Here is the description from YHM’s website.
Specter Customizable Free Float Kits
These Specter Kits give you a different look from other firearms by concealing the gas block under the forearm tube. We provide a Flip Front Sight to mount right on your forearm. This gives your rifle a unique profile while providing more rail surface and an increased sight radius. This kit provides all parts necessary for operation on your upper receiver. Designed to free float the barrel even with our End Cap installed. The Specter Forearm has an overall length of 9.675 Inches, and is designed to be installed on a acarbine top end. The Specter XL has an overall length of 12.50 Inches, and is designed to be installed on either a carbine or mid-length topp end. Each kit includes: Customizable Forearm, End Cap (YHM-9484-A), Full Length Rail (YHM-9464), Forearm Flip Front Sight (YHM-9627), Specter Gas Block (YHM-9378), Swivel Stud (YHM-9469), 1-1/4" Q.D. Sling Swivel (YHM-9470).
It comes with everything included in the kit. Asking $175 plus shipping.
Rifle and rear sight not for sale