That's quite true about the muzzle break and also if the piccatiny rail doesn't run the full length of the handguard,then it's a Gen2.Not quite accurate. I have a Gen 2 .308 that came from the factory with a keymod handguard. While there are several differences between the Gen 1 & Gen 2, one quick way to id them is the Gen 2 comes from the factory with Ruger's hybrid muzzle brake.

