Like the Agni-Pattern Power Maul listed here: http://dark-heresy-rp.wikia.com/wiki/Agni-Pattern_Power_Maul

Should the wgt really be .75kg?

Obviously this is a typo . Agni-Pattern = 7.5 kg, Lathe-Pattern= 5 kg (not .5) is much more adequate weight .

That was what I was thinking but I wanted to see if there was any official answers

Obviously this is a typo . Agni-Pattern = 7.5 kg, Lathe-Pattern= 5 kg (not .5) is much more adequate weight .

7.5kg?! Cyclopea is 8.5, and it's a HUGE two-handed monstrosity. A metal Tower Shield is only 7kg.

Ultima pattern (Ascension) is 3kg, Rare. (D10+5I Pen 5) in high-power mode.

Agni pattern is 0.75 kg, Rare and is weaker in high-power mode (D+4E Pen 4) and said to be a less bulky model carried in peaceful areas and as "sidearm" for vehicle crews.

Lathe is 0.5 kg, Very Rare, said to be particularly slim version, and indeed does (D-1I) in low-power mode - less Impact damage than a (2.5kg) baton.

Shock Maul 2.5kg Scarce

On the other mechadendrite, Power Blade is (D+3E Pen 6), 1.5kg, Very Rare (Availability matters in that we can assume disruptors are comparable, not greatly superior or inferior). Comparing to combat knife (0.8) - it does not look like good disruptor generators and cells are weightless.

Also, Lathe pattern includes a spiked hand-guard.

Maybe, 1.75 and 1.5 kg respectively? That's still cool and makes sense in context (to carry Agni power-maul rather than a baton or shock maul, if you can get it, but not sure you'll ever need it), and not complete cotton candy.