Yes and no.
I would get a mil spec bolt and bolt carrier and barrel. The barrel should be a real 5.56 NATO barrel - chrome lined or not. That way you can shoot surplus 5.56 safely in your gun without fear of overpressure (some are chambered for 223 with much shorter throats.
The bolt and bolt carrier are a hard use item and between the good steel and strategically chromed parts, properly assembled, you won't have problems. From Bravo Company's website:
Bolt carrier group (auto version) for your AR15, M16, or M4. Parkerized exterior and chrome lined inside carrier. Machined to USGI specifications. This M16/M4 carrier includes the proper Mil-Spec gas key. Gas key is chrome lined and heat treated per GI specifications. Gas key is secured to carrier via USGI domestic mfg Grade 8 fasteners and properly staked per Mil-Specs. These properly hardened parts insure a strong staking and proper gas system functioning.The bolt assembly is machined from the correct Mil-Spec Carpenter No. 158® steel, shot peened for increased strength, includes tool steel machined extractor and ejector, BCM Extractor Spring, and is HPT (High Pressure Tested) and MPI (Magnetic Particle Inspected).