FNMI 20" 5.56 MP Chrome-Lined
FMB forge marked A2 Upper
non-F marked FSB
Rifle feed ramps
The bolt carrier group is Colt. The carrier itself is C stamped and the bolt is stamped MPC. Carrier shows signs of having been shot, but bolt still holds carrier up by itself without collapsing. This is the original BCG that came with the upper when purchased as surplus. It may or may not be the original one paired with this rifle in service. It's plausible that it could have been swapped in service. I haven't seen a genuine USGI FN bolt carrier group out in the wild to compare it to.
Charging handle has an "N" stamp. I could find very little information on this.
Asking $720 shipped. Prefer USPS money order payment, thank you!