Spycraft to Fantasy Craft DR are actually pretty similar.
A Tactical Vest has DR 4, putting it roughly on the line of Hardened Leather. There is only a couple of items that go above DR5, and only one above 7. So Articulated Plate with Heavy Fittings is equal in all but cost. That said, guns aren't "too good" in Spycraft, and I've had players use Melee weapons in Spycraft games without being underpowered.
I'm not familiar with the Dragonstar setting, but mechanically you should be totally fine importing them whole-cloth. If the setting doesn't really have modern technology, you might streamline it a little - remove electronic sights, laser targeting, and a few other upgrades. The alternate is to re-script the weapons for Fantasy Craft, which is what I'm doing at the moment (for Industrial Era and beyond).