So I take it that a “Colt Light Machine Gun front end” is otherwise known as a bipod?
No, the Colt LMG was a super heavy barreled variant with a belt fed upper configuration and a squared handguard, but yes, plus a bipod located below the front sight assembly.
Added:
It is the left most AR type rifle on the table showing two ARs on bipods plus others lying on their side. It also has an FNAL looking carry handle to the left of the handguard.
from the picture, it simply looks like a semi-auto AR with the heavy bbl and handguard config.