Hello world. So I want to build my own AR9, but I'm having the hardest time understanding something. So I'm pretty sold on a Gibbz side charging 9mm upper receiver. However, I want an AR9 that supports the LRBHO function. The Gibbz doesn't say anything about LRBHO. So that leaves me with questions. If I buy a lower that DOES offer LRBHO, will it work the Gibbz upper? Will I have to find a side charging upper that does support LRBHO? I'm very confused and I don't see a whole lot of info regarding this particular set of questions. One gun salesman, and a good friend of mine say that it should work. Another salesman says it won't and that it all relies on the upper. Please help me get this damn thing built!

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