This one badly needs a re-do. The “cold blue” someone did before me ain’t cutting it. For me to park it, is the quickest solution.
I just ordered a Williams WGRS. No click, but slick. Is the one in your picture 20”? It looks well proportioned.
That is 20". I also have an 18.5" Carbine. The 20" is a better balanced rifle, esp with the rec. sight.
I've used both the WGRS and FP. The FP is more expensive and requires drilling, but it is a much better/sturdier sight than the WGRS. You will probably require a higher front sight for either one.