I have an SGL-21 that is marked "Legion Trade"  Arsenal.
Whats the significance of the "Legion" markings?

My SGL 20 says Saiga Legion I was under the impression the Legion marked saigas were from the custom line. I could be wrong though.

Edit

ABOUT LEGION USA INC.

Legion USA, Inc. is a an importer of AK-based Saiga rifles and shotguns produced at the Russian Izhmash factory, as well as authentic Russian parts and accessories designed specifically for these firearms. Legion’s headquarters are located in Izhevsk, Russia. The American division of our company, however, is situated in southern Florida in the city of Hallandale Beach.

Izhmash is a weapons manufacturer based in Izhevsk, Russia. It is the main supplier of the famous Kalashnikov series of assault rifles to the Russian army. Along with conventional firearms the factory makes a wide range of other weapons, such as: cannons, missiles and guided shells. Today it is the largest firearms producer in Russia.