I own an L1A1 as issued and it eats anything and everything in 7.62*, however it appears to prefer Germanmilitary ammo. I know other club members who own either L1A1s or the FAL, none of them have feed problems. Ejection problems can almost always be solved by altering the gas setting. If I remember rightly we were instructed to change the setting by 2 numbers. I leave mine on 5 all the time.
As has already been said, if your SUIT works and doesn't fall off (like mine does) then you really have hit the jackpot.
* means BritishRG ammo, Prvi Partizan, Lake City, some gash Portuguese stuff, German military ammo plus a selection of reloads.