Can you explain what you would get that is better from a 77/97 ?
If you compare say a 430L it has a robust no side to side movement cocking lever with spring disk washer shims a robust cocking link that wont brake and crack like the HW a rotating piston and a proper quite ABT plus as I have already mentioned a one piece compression tube
The only advantage that the LGU has is the plastic rings and stuff so it is smooth out of the box but the Diana is a better platform.
also the 430L only weighs 7.9 lbs, so it might be a idea to study of the Diana underlever action and then decide if its value for money in comparison