One guy here years ago did nickel boron, gave it that grayish silver look, but it’s also “functional” in that it has lubricity.
He also did his mini Uzi. A Pair of Nines. It looked cool with the black grips etc
See if these help you
Watch
https://www.uzitalk.com/forums/index.php?threads/texas-mac-mac-10-firing-pin.101250/
https://www.scribd.com/doc/103164301/MAC-10-4522105-Firing-Mechanism-for-Semiautomat
The firing pin prob has a spring to hold it rearward (an AR does not). It may require more than pushing it forward bc it may be shorter than the length of the distance between the read and the front of the “block” and the inertia from the hammer striking it carries it beyond the bolt face
I...
I have a not worse story:
I attached my new rifle suppressor on a qd mount and rotated it one turn (like you would a 3-lug) and shot it.
And it went flying off 30-40’
I was like holy sheet. Went and picked it up and fortunately it didn’t have an internal strike / baffle strike. Just some...
I have some hanging on wires between t posts
But the wires are looped on 1/2” bolt threads in the back. The result is a slight angle downward - but the added benefit is that it “gives” a little when shot. Downward. All lead and FMJ splash go down.