Chilean company FAMAE manufactures SIG firearms under license. One of their more interesting guns is the FAMAE SAF , a SIG SG540 rifle scaled down to a 9mm submachine gun. The latest model features a full length picatinny rail and a nifty angled foregrip build into the handguard.
Another interesting gun from FAMAE is the CT-2000, a SIG SG540 chambered in .30 Carbine (one of my all time favourite cartridges). The AftermathGunClub blog got taken on an exclusive tour of the factory and have published many photos online.