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to provide a fast, secure, and enjoyable experience. by Steel Shrapnel, from NC, United States Asked on January 10, 2024
A bolt made for 300 BO is identical to a bolt made for .223/5.56. The dimensions are exactly the same and they are 100% interchangeable, as a 300 BO is just a "necked up" .223/5.56. The magazines are interchangeable between the two calibers as well.
.223/5.56 and 300blk use the same cartridge base and this bolt will work for either. It is still a good idea to check headspace on the bolt/barrel combination you end up with regardless.