Marauder generation? How do you tell?

VERY EASY ....

Look at upper Receiver and note if you SEE 4 ( 4-40 size ) cap screws holding it down to lower tube. Or just see 2 on forward barrel end of receiver ?

GEN 1 will have 2 screws up front and none viable in the rear section.
GEN 2 will have 2 up front, 2 in the rear.
BOTH will have a bolt detente screw at the rear middle area of receiver.
 
All of the above are correct - any one or combination of them will identify the generation . . . and just to explain things on the Gen 1 reciever that Scott described, the Gen I has one screw that holds down the rear of the reciever, but to get to it you have to remove the bolt detente screw and then the bolt itself. The screw is hidden under the bolt.
 
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