So I have an AR-15 with a semi auto bolt carrier and I am looking into getting a full auto bolt carrier. However, I have noticed that my manual said never to switch bolt carriers or bolts with another AR-15 as it can cause serious injury or death. Why is this? And if this is the case, why do companies sell spare bolts, bolt carriers, and grips (such as the Magpul MIAD) that allows you to carry a spare bolt? And don't you have to replace the bolt once in awhile anyway if it cracks?
Thanks in advance.
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