That third page seems to show Dredd shooting at Sov Judges with a Mk 3 Lawgiver. It looks too chunky to be a slender, of-the-era Mk 1. Maybe it's a training sim rather than a flashback at this point?
The previous page suggests to me its the recollection of the bloke in the bed (one assume the fella in an iso-cube awaiting death) and this is flashback.
That suggests the gun in Dredd's right hand is a Lawgiver Mk1 - just how Dan draws it and the gun in his left is just some gun he's got, suggesting the needs must position the Judges are in?
Either way we'll find out when we get there and this looks very exciting!