Brother that's so subjective,the barrel and nut are propretary,uses Fn-Fal mags [i really like P-mags] now RRA has there own poly-mags.The other rifles Armalite,Larue,LWRC,POF,DPMS those come to mind, I mean no disrespect if I omited your brand.Everyone is very passionate about the rifle they have, understandable so.For ME for the money the ambi-features that come with this rifle works for ME.The other option is a build MaTen and others are very impressive,then you pick and chose all your compnents.Respectfully Rene