The guns weren’t live (Christ, imagine that) but are actually amazing CGI by the amazing Huw Bowen. Huw also did the gunfire and VFX on the Athlete video. If you need to hire anyone like that give us a shout and we’ll put you in touch. Here’s another previously unseen photo:  
DSC_0142editfor webbb

A great one too. (Good work Mark Blackburn @ Priory Photography)