On closer inspection, you are correct. Mixed up the MK43 with an E6.
Out of the four models, the E3 is the standout. Would be great to see one on the skirmish field.
Imagine Lambda defence is tied up with their new B&T Smgs and GPMG series. Still if the LCT gets a bit of traction, they might end up releasing a conversion kit. If I was coughing up the big bucks, a LCT based model might be preferable to an A&K model. Time will tell.