I shoot High Power Service Rifle, I have a WhiteOak Service Rifle Upper with a 20" 1-7 Wilson barrel. Just had it rebarreled before last season by WhiteOak for Camp Perry 2023.
I shoot 600y easily with both a 77g SMK or 80g Hornady ELD with 24.1gr of Viht N140 IMI case and #450 Magnum Sm Rifle primer that I developed. At 100y I one hole the 77g SMKs and get just under 1" group with the 80g ELDs.
The original Wilson Barrel I was about 4000rds through it and it was still holding strong, one of my peers has close to 6000 on his and still holding up. When WhiteOak rebarreled/refurbed my upper BCG had little wear and for good measure they replaced the cam upon their recommendation. Gas seals, firepin, bolt was all still in spec. I keep a spare set of gas seals and firepins with me all from WhiteOak.
Can't go wrong with WhiteOak or any of those components.
My CMP/NRA High Power Match Service rifle is Magpul UBR Gen2 Stock, Stealth Ballistics weight, Geissele H1 Super 42 Braided buffer system, Geissele Lower and LPK, Geissele High Speed NM trigger with Service Rifle Springs, and a Hi-Lux XTC scope. Not super precision but the rifle shoot better than what I can shoot with it. I have a second lower built on a S&W lower with a Geissele LPK, Magpul UBR Gen2 stock, Stealth Ballistics weight, Geissele H1 Super 42 buffer system, and Geissele SSA-E trigger. I use this for NRA match rifle and I use the Geissele for Sanctioned CMP matches.
For serious competition I would trust nothing else but WhiteOak/Geissele/Magpul.
https://www.whiteoakarmament.com/complete-bolt-carrier-assembly.html