FAL guys, need help identifying this lower

[Anangrypasta]

Hi guys. Got this Century R1a1 build and was wanting to identify components and their nation of origin. I believe the barrel and gas system are Austrian, however no numbers on this rifle match. Anyone got any idea where this lower came from? No other marks besides the selector and serial.

 

[TGuns1451]

If you break it down Is there another longer set of numbers on the other side hidden, or inside the mag well? I think the different numbers are factory numbers. Then for some reason certain countries added the other set when issued into service I imagine. Libya or Syria in the 80s be my guess from what I read.

 

[Fear21]

Looks like a West German G1 lower. Your upper is Imbel (Fz SA).

Century put R1A1s together out of basically every FAL kit they could get their hands on, including mixing inch and metric kits... you have some of the best receivers available.

 

[Anangrypasta]

Cheers guys. Thanks. It's been fun trying to ID bits and pieces since they all have their own personalities and character.