Just my opinion, but its well worth what you paid for it!
I would be very pleased to purchase that gun for $375
Nice 03A3's go for $500++ depending on a lot of factors.
Your pictures do not allow for telling if all the parts are original or not.
(Looks like it might be a restore project with all GI parts)
Regardless, Congratulations!
PS, If you decide its meh, send me an e-mail, I will take it off your hands, I am sure we can deal.