Impossible to find a quad rail for. - Sons of Liberty Gun Works East India w/ Front Sight Base Combat Grade Starter Kit

I love SOLGW. But this upper is obscure. The front cap is m4 style. And the gas system is mid length. Almost all production quad rails are triangle front cap/mid length. A m4 front cap/mid length system does not appear to be the standard. So why SOLGW put the round style on? I can’t fathom. I’m going to play gun smith and sift the fsb pins out to replace the front cap with a triangle. Then a MI industries quad rail will ride this upper. Disappointing. I really wanted a drop in option.