Yes, it is the plugs. Since you switch a mag off people often say clearing
a mag even though it's sort of like saying "digging a shovel".

Mags do foul for very different reasons but the only way to clear them is
with a wallet.

--
Roger Long

Roger, when you say "clear a mag" do you mean clearing plugs? Because
it isn't the mag that fouls, is it? Isn't it the plugs?

Thanks, Corky Scott