Zül-Qarnaįn Nantambu says he’s the guy on video scuffling with Antonio Brown outside the Adin Ross boxing event in Miami … and he claims Antonio went to grab a gun and shot at him.

Zül-Qarnaįn tells TMZ … AB squeezed off a couple shots during Friday night’s incident, and there were kids around when the former NFL player pulled the trigger.

Video appears to show Antonio running through a crowd with a gun in his left hand, and you see him turn a corner and raise his arm before multiple gun shots ring out.

Antonio ended up being detained by police and released … and he says he was fighting off some alleged attempted robbers.

Zül-Qarnaįn is calling BS though … he says the guys in the video fighting him were all on AB and Adin’s teams … and there was no robbery attempt whatsoever.

Antonio hasn’t addressed the alleged gun but Zül-Qarnaįn is pointing the finger here.