The open action of the Garand, M14, M1 Carbine and Mini-14 have all proven much more susceptible to jams due to dirt ingress than the closed action of the AR-15.I prefer the Mini 14 to the Ar-15 in real world use as they are extremely reliable and do a good job of shucking any dirt out of the action rather than grinding to a halt like the close tolerances AR-15.
E.