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Discussion Starter #1
I have an Arsenal 5.56x45 106CR front end I want to build into a rifle. I have a Bulgarian AK74 5.45 trunnion, bolt and bolt carrier. Will any or all of these work for 5.56 or do I have to track down hen's teeth?

Thanks!
 

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Not an expert, but google says that 5.56 and 5.45 have different case sizes. So you definitely need the proper bolt+bolt carrier.
 

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The bolt and carrier question was answer by AKBLUE in a different thread. He mentioned different sizes, what matches what and so on. Try searching for his posts to clarify some of your questions.
 
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