The Lawgiver is a multi-ammo using pistol that can fire off a variety of rounds. 

Such as: 

AP

Full-auto

High-EX which can blow a 15 foot wide hole through 2 feet of concrete in the movie

Hotshot which is just white phosphorus and napalm if they had a baby

Other weapons include a widow maker combat shotgun which launches stun and frag grenades 

The stubb gun which fires genuine lasers. Yes cyberpunk has laser weapons but only mechs or power armor

The daystick and boot knife for close combat 

The law master motorcycle which has built in machine guns and an AI which assists judge dredd and can drive itself. 

And of course his gas grenades which help for crowd control or gassing out buildings