I have an 03 sporter that I believe is a Hart Arms product
Has the same sling swivel bases as the OP rifle.
My rifle also has the same engraved trap door butt plate as the Hart Arms rifle in Link#1 posted by 375WhelenIMP.
Mines built on a NM action which was searched and verified by a member here in the past when I posted some pics of it.
Lyman 48 rear sight,,no Bolt Peep arrangement. Has a side mount base attached. I have no idea what mfg'r. I like iron sights anyway.
Stock was said to look like John Dubiel's work as well.