DevL,
I won't argue with you about the weight or complexity problems. However, the ZM Weapons LR-300ML has problems on full auto. Because of its design(modified gas/op rod system), the springs will heat up, lose their temper, and eventually fail.
As I understand it, the recoil spring is wrapped around the op-rod(I've actually forgotten exactly what my source told me.). Anyway, I know the spring is wrapped around something it shouldn't be. Because of this, according to several of my sources, the LR-300ML simply cannot handle being run extensively on full-auto. If you are going to bring up another weapon system, you would be better served by talking about M2 Corporation's M16SP, M16-C, and M16SP-2. Of course, these weapons don't address the recoil issue, but they do seem to solve the reliability and overheat problems with regards to extensive full-auto fire. They are currently in use with several elite military units because of this.
Best,
David