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as for the conversion it can be done but it is a pain. The 556 is not a real good candidate for the conversion and is a hell of a way to get into your first. The barrels have to be turned, threaded and chambered for the particular receiver you have. The guys in new hampshire have pretty low standards so nothing is interchangeable barrel wise....at least if you want the gasblock and port to line up. Your gas system will need to be modified rather substantially to be useable with and without suppressors and sub or supersonic ammo. The consequences of over-boosting are damage to the bolt and receiver. Under-boosting means your action won't cycle. I built the 552-300 and won't do another because its just not worth the trouble. Too much opportunity for problems and in a 556 you really aren't gaining anything worth those problems. There are a lot of parts and knowledge out there for the AR's and bolt guns that will help you end up with a good useable rifle and less trouble.
Good luck regardless of which way you choose to go.
Barrel blanks can be had from Pac-Nor and Lilja. I recommend you go with stainless and I like Lilja barrels the best.
Frank
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Threaded Mode