When someone tries to sell you guns/ammunition to overthrow the government, there is a 99.999999% chance they work for the FBI.
I remember a guy way back in 1973 trying to sell me guns. He even had a cheap printed catalog with prices. He would not say where he got them.
I figured these were stolen guns and backed away. But some of those guns were nice.
Reminds me today of the gun salesman in TAXI DRIVER.
