this was my understanding as well. in fact i thought that the DC K was a stock unit that was modified and then further reinforced with additional metal. of the few i've seen, it didn't appear to have any significant weight savings or addition either way, at least to my calibrated hairy eyeball. oh, and the welds somehow looked even worse than a factory k.
anyway, resident expert @Jim Lusk would have the full scoop on them. with a tag, hopefully he chimes in.