mI3 I belive
extremely cheap semi Autos.
Fully auto is something usually not allowed on most fields, and well you would be looked down upon by most players. besides. with the magnetic triggers and such Rate of fire issues, well are just not issues. full auto is actually slower than the fastest semi- auto users.
EDIT: ok, it was M3, I was close
Sorry Clutch if this for profit web site bothers you, but it is not a competitor, and well, he asked.
oh and I also have no affiliation with them. feel free to block.