Does SAMCRO get all of their guns from the True IRA or do they have other suppliers?

It makes sense that the True IRA can get their hands on AKs and other Russian military hardware because of how easy it is to access weapons stockpiles in Russia and the former Soviet republics. But I doubt that the Irish would be able to supply M4s to SAMCRO because the M4 is an American-made gun that is harder to come by on the black market. So, do you think that the club get the M4s from another arms supplier?