Hi all I'm customizing a SKS I have and Can't seem to find a Rear Rail that does not replace the receiver, only screws over it. Since I hear the receiver mounted scopes that replaces the receiver have a horribly zero retention. I was also looking into hand guard rails too for a red dot or scope but I have never shot a gun with a scope so far froward and do not know how that would affect shooting, I would also lose the iron sights. Any help or suggestions would be appreciated thank you. Its a Chinese SKS I do not know anything more.