6.5 Creedmoor turned the precision-rifle world upside down, and it does the same for large-frame ARs. At Arm or Ally you’ll find everything required to transform—or build from scratch—an AR-10 that consistently rings steel past 1,000 yards. Start with match-grade barrels from Ballistic Advantage, Criterion, and Faxon in lengths from 18" to 24", all spun from 416R stainless and button-rifled with a 1:8 twist to stabilize the high-BC 140-grain class bullets this cartridge loves. Pair your barrel with a DPMS- or Armalite-pattern bolt-carrier group; we stock Toolcraft and Aero Precision BCGs head-spaced to SAAMI 6.5 CM specs and finished in black nitride, DLC, or NP3 for low-friction cycling. Gas tuning is critical when jumping from .308 to Creedmoor’s hotter pressures, so we bundle adjustable gas blocks, rifle-length gas tubes, and JP silent capture spring systems to tame recoil and maintain positive lock-back. Looking to lighten the rifle for hunting? Grab a 15" free-float handguard in Aero’s ATLAS S-ONE profile—M-LOK slots where you need them, skeletonized everywhere else. Topping off the build, our optics section lists first-focal-plane scopes in the 4-20× range with matching cantilever mounts, plus quality bipods so you can exploit Creedmoor’s flat trajectory. Ammo and reloading components are here, too. We stock Hornady ELD-M and ELD-X factory loads, as well as Lapua brass, Hornady 147-gr ELD-M projectiles, and H4350 powder when allocations allow. Whether you’re chasing PRS podiums or looking for a do-it-all Western-game rifle that runs from the mag, our 6.5 Creedmoor category equips your AR-10 for sub-MOA results shot after shot.