Centry L1A1 was my first FAL, only problems I had were ––crappy furniture, later upgraded and the Century gas piston bent up in the gas tube (common problem with CAI's US made piston) replaced with another US made brand and no issues from there. Some were mising the allen screw locking the front sight pin (in hole in front of gas block) at whatever elevation make sure its there and tight after any adjustments. OH and if it has one of the CAI muzzle breaks on it SOME still have the threads underneath and are secured by a welded over pin, easy to replace with an original L1 flashider if you are not in a still banned state.
looks like you got the STG pattern/type rifle as opposed to the L1 ––same thing I'd remove the CAI muzzle break and put on an stolle or browning flashider sometimes they are sliver solderd sometimes pinned/welded a darkspot at the 6o'clock position of the break will tell you if its pinned usually.