I'd go with Geissele and a standard upper? I bought some spare lowers from Aero a while back and they looked like decent quality gear. But I love my G rails and if an upper is in spec, it usually runs OK.
PB
I'd go with Geissele and a standard upper? I bought some spare lowers from Aero a while back and they looked like decent quality gear. But I love my G rails and if an upper is in spec, it usually runs OK.
PB
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