That answers the question Yes I also like silver & .999 or 90% you know if the SHTF
you have silver that can be melted for what ever use was needed cause it's not cost prohibited .

Legitimate coin sellers sell the 40% with the same rules as silver & it's ok if you want to be a part of that wish silver coin after all $100 face will sell for $500 but really when push comes to shove are you really buying usable silver , it seems not .
For now it's a coin to speculate with but not to put all you eggs (silver ) in that basket . It is the Fiat of the silver coin world . The sellers push " it's silver at 40% " with a low over spot price

I feel many buy it with out understanding it's an alloy . But there is a positive . since many people buy silver ETF's (paper silver) they never even own the AG , they gamble . So one can purchase the 40% with the hope of a gain and a small gain can be taken advantage of due to low over spot .
& worst case you still always have face value . Now any way now I see it's not really a pure silver with little effort .But potentially it is a good alloy for electric conduction



As to the federal law sure it could be enforced but silver seems not to be enforced as our currency is not made of it and the loss of it does not harm our current coin production as a loss .
Those coins are from a day gone by that was our silver the people of the USA had silver as currency.
it was taken from us .
We've had theoretical future scenarios post's like will All copper coins be replaced by steel
all said and done still respectable that our coin currency is copper nickel . except the penny .