Imo the KWA Kriss is the best gas smg built and is a clear choice. I got mine Dec 24 it was one of the first production guns and i love it. I run propane only, this gun has outlasted all other airsoft guns i have owned. I have had VFC aeg 416, TM aeg g36, g&g aeg ump, WE gbb scar all of these other guns have broken down in some way but not the Kriss. I have about 12k rounds threw it and it still looks and shoots like the day i got it.