Question about Silverback DesertTech SRS A2's build material

[Pinto bean]

It says on the website that its made of aluminum 6000 series but not specifically which one.

Viper techs are made of 6061 T6 aluminum just like the real thing.

Does anyone know which aluminum is used in building Silverback DesertTech SRS A2 sniper guns.

Is it some pot metal stuff or is it similar to the aluminum used in viper techs?

Thanks