Back before the AR-15 gained widespread acceptability as a patrol rifle, there were several articles written on the appropriateness of the lever action (whether in .30-30, or .357Mag or even .44Mag) as a patrol rifle for LE. There were several custom shops that were tacti-cooling out the Marlin and Winchester lever guns. It made a lot of sense then, and I can see the value of it now. I'm not a fan of that look, but it's a valid concept.
Lever action is a terrible idea for a "tactical" weapon. The 30/30 cartridge would do fine in a more appropriate set up IMO. I've seen it drop man sized deer from 70-300 yards with no problem and very light recoil. But it still doesn't really provide anything that existing cartridges (5.56, 6.8, .243 etc) don't already have.
Leave the lever action in walnut for hunting and cowboy action shooting. They're a ton of fun and great rifles. but putting rails on them is like putting spinners on a 55 Belair: You will only show the world what bad taste you have.
Edit: Haha I just read Lac's post. I suppose it would have its place in a world without ARs or Mini 14s and such. Certainly it did the job in the 1860's and beyond on the battlefield and on the trail.
If I lived down under, I would think that a lever gun would be your best option for a fighting rifle. Personally, I like the Browning BLR in .308. The BLR is going to cost a lot more than the Mossberg, but the range and accuracy is significantly better. You can even get a take-down model. As much as I prefer .30-06, you can no longer get surplus ammo consistently in that caliber, but surplus 7.62mm NATO is usually available. And, of course, since the BLR uses a box mag, you can use pointy bullets.