Nothing so far screams fake, but (just my opinion)the gray paint ought to go. I'd carefully strip it to see what's underneath. If there's a half decent finish left, leave it! Refinish as a last option. Unless you can round up the scope that went with it originally it probably won't matter if its a Mk1.
I'd swap you my Mk2, but its the only one I have and its very happy on its current (mismatched to it) rifle. Now if it was S/N 5966(?) or 124 then I'd beat the doors down! Please don't tempt me too much though... Not sure from your original post whether the bracket matches the receiver number, I wouldn't swap off that part, but they're usually quite well staked. Have you looked at "Angel's" matchmaking forum on this site?
BTW There's internet in TN! And been up 23 hours straight -again...