Question on T/C Hawken shotgun

[Buckshot Bill]

I recently purchased a T/C hawken (15/16") with an aftermarket shotgun barrel. Barrel is 28" octtogon to round, bead sight, .618 bore (20 ga)The barrel resembles those sold by navy arms and toledo arms but is completely devoid of markings. Did anyone else make these, or is it safe to assume this is likely a barrel from one of those two merchants?

It does not resemble a sharon barrel due to having screwed on brass hawken style ramrod pipes instead of the soldered steel ones.

[Maven]

In the late 1980's - early 1990's, Navy Arms offered a 20ga. smoothbore, with screw in chokes no less, similar to what you describe, BB. Bead front sight, but no patch box, anodized Al trigger guard & nose cap + rubber recoil pad. It was made by Investarms, however, rather than T/C.