Like new rail system that I bought from a friend before I found out it won't fit a DPMS rifle.
Its marked A.R.M.S S.I.R AR-10 Rifle Bi-Level. It has three little accessory panels with it including one with a sling swivel. I bought it a couple of years ago for nearly $400. He had it mounted but never shot it and he took it off when I bought it.
After reviewing some other ads I'm going $235 shipped. SPF
Trades considered -
Magpul .308 PRS with buffer, spring, tube etc.
Magpul 5.56 PRS with buffer, spring, tube etc.
New Armalite BCG for AR-10
.308 A3 Upper for DPMS style rifle
Semi-auto 20g or 12g shotgun like an 11-87 synthetic with a 26 or 28 polychoke barrel.