AR gas block

[green country shooter]

I would like the replace the front sight-gas block assembly on an AR with a flat top or a flat top / fold down front sight. I have had a good experience with G & G but thought I'd see if anyone had any suggestions.

 

[anythingshiny]

yankee hill machine works well on my AR. i have flips on front and back with no issues after plenty of rds

 

[green country shooter]

thanks