SOLD*Midwest Industries AR Forearm Rail
As seen here...
Mine is the black, Colt version. #MCTAR-17C
I had it mounted on a Bushmaster and it fit fine, but it will have a little
front-to-back play if mounted on anything but a Colt.
This play didn't bother me when it was on the Bushy.
Very lightly used. Discoloration is just some oil.
IM if interested.