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Discussion Starter · #1 ·
i've been looking into building an ar upper, i want an A2 style, i've seen upper recievers say they have m4 cuts i thought that was on the barrel in the feed area where would i look in the reciever for them and are the needed for the a2 style build? if its not needed on the reciever can i still use a barrel with m4 cuts? thanks in advance
 

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You want to see them extend below the barrel into the receiver.
 

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Discussion Starter · #4 ·
thanks for the reply's, GUNSLICK1 thanks alot for the link it gave me all i needed to know
 
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