Mega Billet upper and lower

[Jifplumb]

What would be the best drop in bolt carrier for this upper? Upper came with charging handle. Not wanting to do any mods on a new set up what do you guys think?

[Dannicus]

Pick a trusted brand name from a hat, they'll all fit and function.

[Dattebayo]

What would be the best drop in bolt carrier for this upper? Upper came with charging handle. Not wanting to do any mods on a new set up what do you guys think?

I would drop one atleast with a matched bolt to your barrel as that is a significant variable in accuracy in the rifle.