This is a Colt Match Target Match HBAR (TM) lower receiver. Small pivot pin hole, large trigger group holes. The included trigger group is probably not Colt manufacture, possibly RRA or DPMS.
The shown in photos bolt hold-open is not included and has already been removed.
The finish is original *UNDERNEATH* the Brownells moly spray-on and baked finish shown in the photos. Repeat, it was not stripped and new finish applied, but simply degreased and painted with the product from Brownells. There is a single scratch that appears to go through to the "white" between the trigger pin holes as seen in the left side photos.
The smudged look at the end of the serial number is the last 2 digits smudged using a software tool.
Any questions, please feel free to ask. The price is not set in stone, offers will be thoughtfully considered.
Thanks for looking.