Please don't ask me about how to make a gunsight.
kurakura made gunsights (not me!), if you like them, please say thank to him.
He's not on this community. and I don't have a technique of drawing. so we can't help you. Sorry.
But mason or other good guys might help you...
BTW thanks for using my sound collection, Kevin.
I'd release new sound patch in this week.