>>64408563
>reciprocating charging handle
>worse recoil impulse making follow up shots slower
>heavier
>bulkier
>kills optics
the supposed benefits were bullshit as well
>supposedly longer service and maintenance intervals
>supposedly healthier for troops due to less gas in the face
>supposedly cleaner and cooler
because of troops having fun with sustained full auto the none of these supposed benefits were realized. piston systems are only marginally cleaner and cooler at a significantly greater expense.
The real maintenance problem with small arms comes from full auto fire which causes a tremendous amount of heat to build up in the system that more or less destroys the entire gun over a short period of time.