Best M16 Barrel & Front Sight (WA/WE)

[MaybeStopCalling]

Hey guys, figured I'd ask someone in the know.

I'm working on a C7A2 build out of the WE system at the moment and planning out all the parts I need to procure. I have the WE to WA barrel adaptor, so that opens up my options.

Basically, which is the most durable barrel and front sight assembly I can buy? I'm not a fan of the AEG type of screw on front sights which ends up loosening, losing zero and scratching the barrel, and if it comes to it I'll buy a WE front set (Where the front sight naturally zeroes as it screws into a recess in the barrel)

But, I figured I'd ask for the best finish and/or best attachment of front sight to barrel before making my purchase.

Thanks!