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Hello I’m kinda new at this, but I would like to build a 9mm ar. I have a few questions. I’m getting a Stripped slick side 22-9mm upper. I already have a mil spec lower with a drop in trigger. I need a 16” barrel, is there any brand to stay away from? I know I need a special bcg and buffer and spring, a barrel nut, I’m going to use a m-lok free floating handguard. Is there anything I’m missing? Thanks
 

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Buy a complete upper will save you some trouble. If you are using a milspec AR15 lower, you will need a magazine adapter. Make sure you get a 9mm buffer.
 
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