05-18-2017, 01:35 PM
I have a GemTech bolt carrier and it has what I think can be described as sand cuts (although I don't believe GemTech calls them that). The reduced carrier/upper bearing surface did definitely smooth up the hand cycling of that AR, but for precision work I really like something with as much bearing surface as possible to ensure the bolt carrier remains true in the receiver; to that end I like Young's Manufacturing bolt carrier.

