My apologies for being so late to reply, I managed to steal the Dark Heresy books (Arbites supplement as well as the core book) from a friend and also managed to dig my copies of Shira Calpurnia books to hunt for more details but as expected of this project, RL had a nasty spike of time consuming incidents so I was a bit occupied

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Despite the Power Maul points problem, I don't think I can drop it from Arbites personnel as it is just too iconic and widespread. Although , the fluff offer a couple of drawbacks that may balance the Power Weapon Blob issue. Individual models are pretty powerful and relatively cheap but the army options are severely limited, with no organic las /
plas / arty options and limited number of missile and melta options. They are quite durable while they are standing still with shields locked these guys are a nightmare to dislodge especially with regular shooting or melee but this leads to a distinct lack of mobility and extreme vulnerability to templates
The average Arbites trooper comes equipped with Carapace Armor, Suppression Shield, Shotgun, Power Maul, Frag, Krak and Blind grenades,
Each (5 man) team has an option to replace Shotgun&Shield of a single Trooper with Grenade Launcher or Flamer.
The basic troop is the Arbites "xxx" Squad. On paper there are many different squad types (patrol, combat, shock to name a few) but in reality, (except shock and castigator squads) these names only express what special weapons (if any) these squads carry.
Arbites Squad
1 Proctor Senioris (Replaces a Proctor)
1-4 Arbites Teams
0-4 Specialist Teams
0-2 Heavy Support Teams
Arbites Team:
Each Arbites Team consists of 1 Proctor and 4 Arbitrators.
Trooper / Proctor: WS4 BS4 S3 T3 W1 I3 A1 Ld8 Sv4+/5++
Proctor Senioris : WS4 BS4 S3 T3 W1 I3 A1 Ld9 Sv4+/5++
Carapace Armor, Suppression Shield, Arbites Shotgun, Power Maul, Grenades
One Arbitrator in each team may replace his shotgun and shield with a grenade launcher or flamer
Any Arbitrator equipped with Arbites Shotguns may replace them with Boltguns
Shield Wall : +1T when at least 4 shield equipped models are in base to base touching formation.
Multiple Lines: Arbites Teams are trained to work together and in chaotic riot conditions, filling the openings in shield wall regardless of force organisation. Routed team/squad's path can fall back to existing standing teams/squads, and bolster that unit.
Specialist Teams:
An Arbites Squad can be accompanied by 1 Specialist Team per Arbites Team.
Marksman Unit : WS4 BS4 S3 T3 W1 I3 A1 Ld8 Sv4+ (Sniper & Spotter)
Carapace Armor, Suppression Shield, Sniper Rifle, Spotter Scope, Power Maul, Grenades
Cyber-Mastiff Handler: WS4 BS4 S3 T3 W1 I3 A1 Ld8 Sv4+ (Handler) / (Cyber-Mastiff)
Carapace Armor, Suppression Shield, Arbites Shotgun, Power Maul, Leash Interface
Grapplehawk Handler: WS4 BS4 S3 T3 W1 I3 A1 Ld8 Sv4+ (Handler) / (Grapplehawk)
Carapace Armor, Suppression Shield, Arbites Shotgun, Power Maul, Leash Interface
Verispex Adept : WS3 BS3 S3 T3 W1 I3 A1 Ld8 Sv5+ (Tech Adept&Tech Adept)
Light Carapace Armor, Suppression Shield, Stubber Pistol, Power Maul, Auspex
Medicae : WS3 BS3 S3 T3 W1 I3 A1 Ld8 Sv4+ (Medic & Medic)
Carapace Armor, Suppression Shield, Stubber Pistol, Power Maul, Medikit
Heavy Support Teams:
An Arbites Squad can be accompanied by 1 Heavy Support Team per 2 Arbites Team (rounded up)
Heavy Support Team: WS4 BS4 S3 T3 W2 I3 A1 Ld8 Sv4+
Carapace Armor, Suppression Shield, Heavy Stubber, Power Maul, Grenades
May exchange Heavy Stubber for a Heavy Bolter or a Breaching Ram
Breaching Ram: S6 AP2 always goes last
This power ram is a heavy tube with a pair of long handles running down each side of its length. Inside the tube is a potent power field connected to a piston, the head of which is often sculpted to resemble an Imperial Aquila. Held by two Arbitrators, who swing it against a door or even a wall, the Bakka-patternPower Ram drives the piston forward, surrounded by the flickering energies of the disruption field. The weapon is powerful enough to blow most doors clean off their hinges, and is more than capable of knocking holes in solid brick walls in seconds.