I own an Olympic Arms 16” free floating bull barrel and am pleased with it. I would suggest a flat top and as someone said its about the sights.
Buy at a gun show, or a private owner. There are a ton of weapons out there that guys purchased, fired it once or twice and are now hard up for money. Deals are everywhere.
Enjoy.
I’ve got a couple of AR’s, a few Garands, an SKS, several .22s, and have sold several FALs and L1A1s. Looking for an AK-74 now.