What can anyone tell me about one of these?

Do they digest most any ammo?

Mine shoots most anything I put thru it. Right now all I can get is some stuff in a brown box I have no idea where it came from. It's military non-corrosive and is $10.99 a box. Goes bang everytime.

Because of the adjustable gas system of an
FN-FAL they should handle nearly any proper "factory" ammo.

Just make sure you know how to properly set the gas system.

You'll have to shoot it to know for sure, but some Century guns built on Century receivers had a weird feed ramp nicknamed the "unibrow". Some of these feed, other ones don't.

Century also built rifles on the great Imbel receiver.
Unibrow FAL Discussion

What Becoole said.
Century put together many differant mixed part FAL's most of them OK some not.
Once you get the bugs worked out ,if you have any, then they are fine