the shrike is vaporware lots of angry spams wrote the bloke cheques still not got the guns.
mind you physics gets in the way. lots of heat generated in a lightweight package.
thats why the lsw sucked as machinegun even if you sloved the 30 rd mag problem it would still get to hot to handle too quickly
Knight Armament Corporation has come up with some novel and clever ways of dealing with the heat dissipation in their furtherance of Mr Stoners design. I think their belt fed widget, name escapes me at the moment, is worthy of watching as a likely potential piece of issue kit in the future. The increasing of outer barrel surface area and resulting weight reduction has resulted in some very 'decorative' barrels.
The thing is back in the days of 'nam Stoner was knocking out alsorts of prototypes, one offs and limited production runs most of which never saw polite company.