The most recommended specifications are: 1) constructed of C-158 steel; 2) shot-peened; 3) HPT (high-pressure proof tested); 4) MPI (magnetic particle inspection); 5) Colt or equivalent extractor spring.
Obviously a Colt Bolt fits those specifications - a quick look revealed that $99.00 seems to be the lower end of pricing, the forum sponsor, G&R Tactical has them at that price.
BCM and Daniel Defense bolts run a little less and hit all the specifications.
If you want to shop Colt, google Colt Bolt Assemblies, for a general search use AR Bolt Assemblies. That saves a lot of sifting through websites.
Patriotism means to stand by the country. It does not mean to stand by the President... - Theodore Roosevelt, Lincoln and Free Speech, Metropolitan Magazine, Volume 47, Number 6, May 1918.
Every Communist must grasp the truth. Political power grows out of the barrel of a gun. Our principle is that the Party commands the gun, and the gun must never be allowed to command the Party Mao Zedong, 6 November, 1938 - speech to the Communist Patry of China's sixth Central Committee
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