Tell us more please, which action. 2 lug or 3 lug, build ? cartridge ?
I got the 3 lug sar with 223 bolt face, and had 2 barrels spun up by Dennis at go ballistic gunsmithing in 20 tactical! Rifle build is;
KS SAR action
Benchmark 1:10 twist and a krieger 1:11 twist
Mcmillan htg adj
Trigger tech diamond,
Hawkins precision bottom metal.