Does anyone feel like the Power Mace is a little underwhelming? I thought it was really awesome when I first got my book, but yesterday I was making a new character, comparing it to a power sword for effectiveness. I realized something. The power mace is bad. In any situation where you could have a power sword or a power mace, the sword is always better. Without exception. Not to mention there is no Legion Power Mace, which doesn't seem to fit, since there is a Legion version of basically every other power weapon, and a lot of other weapons besides. So I propose these changes and additions.
Power Mace
1d10+5 E
Pen 5
Concussive [0], Power Field
Very Rare
Legion Power Mace
1d10+6 E
Pen 5
Concussive [0], Power Field
Extremely Rare
Neither variation has a two handed requirement for Concussive, which was the game breaker for me.
Some other suggestions. These changes also allow these weapons the option of taking the Belt Feed upgrade, which was prohibited by the fact that they had no full-auto option. I felt like the option was logical, given that belt feeds are seen on so many ranged chaos weapons. It does make it easier to hit with those shots that are full-auto, but I think the changes to full auto balance it out.
Bolter, Twin Bolter, and all Legion variants
RoF: S/2/3
M34 Autocannon
RoF: S/2/3
Reaper Autocannon
RoF: S/2/4