u/Curious-Crabapple

I recently purchased a Federal Ordinance, M1a manufactured date ~1986. I bought it off of Gunbroker. It has a US tactical systems m21 scope mount. It shoots great but according to my gunsmith, the optic that I bought it with is broken beyond repair. I’m looking for a new scope that is historically appropriate/adjacent. What does this group suggest? I’m a recreational beginner shooter.