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Discussion Starter · #1 ·
I acquired an MK2 upper..I know I can use a Standard/MK1 and an MK2 bolt in it. What about a MK3 bolt?
 

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Discussion Starter · #2 ·
Customer service said all bolts are the same EXCEPT a MK2 or MK3 bolt does not have the cutout for the safety engaged hold open that Standard/MK1 bolts do. Other than that it works...
 
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