Here is the info from the upper...
16" barrel marked C MP 5.56 NATO 1/9 HBAR
removable carry handle marked A-7 with 6/3 elevation dial
Upper receiver is marked C AF or an AF design?
The upper is marked with a number 4 above the gas tube.
Has M4 feed ramps extending into upper.
No "T" marks.
Front sight marked F on one side and B "RI" in circle and a 2
Bolt marked MP with a C underneath
Semi auto Bolt carrier marked C
Double heat shield handguards, Bayo lug, flash hider/brake with no slots on bottom, just on top.
Front pivot pin is a large flat head with threaded nut on other side with a slot.
Barrel dated 12/97
Purchased from Hoplite Inc located in KY around 1999-2000.
$900 or FAIR offer. Shipped or pickup.
May consider trade for other tactical rifle. Let me know.
Thank you for looking. More pics available on request.